Arsene Wenger is pleased to have a "committed and focused" player on board after Henrikh Mkhitaryan arrived at Arsenal in a swap for Alexis Sanchez.
Arsenal allowed Sanchez to join Manchester United on Monday to avoid losing the Chile international on a free transfer when his contract expired at the end of the season.
The Gunners received Mkhitaryan in exchange, with Wenger confirming the Armenia international has signed a contract running until June 2021.
Adding a dedicated professional to the squad provided some joy for Wenger in a transfer window he described as "more disturbing than ever".
"The thinking behind the deal is that we have player who has four months contract basically and we move [him] out for free and in exchange we have a player in Mkhitaryan who has a three-and-a-half-year contract," Wenger told Arsenal Player.
"So first it makes sense on a negotiations point of view and secondly we're replacing a very good player with a very good player, a world-class player with a world-class player. That's what it's about, to keep our strength in the team.
"I'm very excited to get a player in who will be committed and focused. That is of course as well very important, where we go into a very important period in the season where every game is basically a very important game so it's important to have players who are focused.
"I must say this transfer period has been a bit more disturbing than ever in the middle of the season, and I'm quite happy when the period is over."
Arsenal have been heavily linked with Pierre-Emerick Aubameyang, with Borussia Dortmund claiming the Gunners made a bid for over the weekend.
Wenger hopes Mkhitaryan, who scored five goals in 39 Premier League appearances for United, can find the net frequently and add creativity alongside Mesut Ozil, another player whose future at Emirates Stadium is uncertain amid protracted contract negotiations.
"Mkhitaryan can play on the wing or in midfield, so I believe he can play very well in many positions," said Wenger.
"That can help us as well because he can play together with Ozil as well as playmaker, so overall it's a good move.
"Maybe where he's a bit short is on goalscoring but he has improved that. If you look at the number of goals he's scored in his career, it's quite impressive overall.
"It is vital as well to have players who have experience, because we have a very good bunch of young players but we know that it's not sufficient in the Premier League today to put them all in together. You also need a good weight of experience in your team and he will contribute to that."
this if you the fact these two are on the same side now pic.twitter.com/oLLCmhMeUD— Arsenal FC (@Arsenal) January 22, 2018
|Barcelona 6 Girona 1: Suarez treble and Messi masterclass settle Catalan clash|
|Messi makes Girona 36th LaLiga victims to set new record|
|Nigeria demolish Rwanda in FIBA qualifying|
|Jonker shines but India still seal T20 series|
|Deeney ´not bothered´ after ending drought from open play|
|Tigers back to business after Hardaker departure|
|Championship Review: Fulham beat Wolves, Sunderland hold Boro in ill-tempered thriller|
|Lions bounce back to win, Schoeman leaves it late for Bulls|
|Russell eyes Six Nations title after inspiring Scotland to win over England|
|Watford 1 Everton 0: Stunning Deeney finish moves hosts six clear of trouble|
|Benitez rues missed chances as Newcastle lose two-goal lead|
|Heynckes ´can live´ with home Bayern draw|
|Ronaldo is a team player - Zidane hails Real Madrid star´s Benzema gesture|
|West Ham fans reference Hitler in protest at club´s owners|
|Dyche dismayed by decisions before Gabbiadini goal|
|Russell´s redemption comes as Scotland seal rare England win|
|Wagner impressed with Huddersfield´s commitment after vital win|
|No place like home for Schmidt as Ireland leave it late to sink Wales|
|Liverpool win had everything – Klopp enthuses over West Ham´s Anfield rout|
|Khachanov sets up Pouille final after Berdych upset|
|Dunk equals record for own goals in a single Premier League season|
|Chiefs return to winning ways in thriller|
|Real Madrid 4 Alaves 0: Ronaldo at the double as ´BBC´ delight|
|Burnley 1 Southampton 1: Gabbiadini grabs late leveller|
|Brighton and Hove Albion 4 Swansea City 1: Two-goal Murray helps end Swans´ unbeaten run|
|Bournemouth 2 Newcastle United 2: Hosts in thrilling fightback after Gayle double|
|West Brom 1 Huddersfield Town 2: Van La Parra and Mounie seal vital win|
|Liverpool 4 West Ham 1: Salah nets again as Reds climb to second|
|Svitolina retains Dubai crown as Kasatkina runs out of steam|
|Ill Neymar included in PSG squad for Le Classique|
|Bayern Munich 0 Hertha Berlin 0: Lewandowski´s run ends as leaders are held at home|
|Ireland see off Wales in Dublin thriller to stay perfect|
|Gattuso surprised by AC Milan´s growth since taking over|
|Lambert defends ´best goalkeeper in Britain´ Butland after own goal error|
|Stokes expected to face Black Caps|
|Mkhitaryan, Ozil potential excites Mertesacker|
|A-League Review: Perth Glory in dramatic win, Melbourne Victory end losing streak|
|Leicester City 1 Stoke City 1: Butland howler costs Potters|
|Matic insists Man Utd can still do ´big things´|
|Fisher´s birdie streak secures share of Qatar Masters lead|
|Chinese Super League transfer window makes Simeone ´uncomfortable´|
|Ingolstadt score bizarre tap-in after Duisburg goalkeeper goes AWOL|
|Allegri cautious over Dybala fitness despite Higuain injury|
|Napoli´s Zielinski better than De Bruyne, claims Boniek|
|Seven-try Crusaders beat Chiefs, Waratahs and Brumbies win|
|Mourinho predicts ´amazing´ period for Manchester United|
|Mears expects ´good England win´ at Murrayfield|
|Barcelona midfielder Rafinha hoping to seal permanent Inter move|
|EFL Cup final: Where do Aguero and Aubameyang rank among Europe´s elite?|
|Klaasen and Mulder get Proteas Test call to face Australia|
|Settled Salah demands Champions League qualification for Liverpool|
|England not polished article - Shaw|
|Dembele staying focused after ´genius´ praise from Pochettino|
|Spain survive scare, USA cruise in World Cup qualifying|
|Shapovalov moves into Delray Beach Open semis|
|Davis, Jokic star with huge performances|
|Alli doesn´t dive, says Hodgson|
|Timberwolves star Butler suffers knee injury|
|Penguins acquire Brassard in three-team trade|
|Verdasco ends Thiem´s Rio Open title defence, Monfils exits|
|Salah has world´s best left foot? Don´t forget Messi – Klopp|
|Pochettino: Vertonghen one of Europe´s best defenders|
|He hasn´t raised the bar – Wenger plays down Guardiola success|
|Woods stays solid as List, Lovemark lead|
|Cake and victory for birthday boy Pouille|
|Klopp ´really proud´ of Firmino after Holgate case dropped|
|Munster upset Warriors as Leinster crush Southern Kings|
|Bouchard ´vindicated´ after USTA settlement|
|Warriors fall to impressive Wolves, Saints stay perfect|
|Conte: Chelsea´s winning mentality can´t be questioned|