Former Arsenal captain William Gallas has expressed his concerns over January signing Leandro Trossard.
Trossard, 28, joined Arsenal from Brighton in the January transfer window in a deal which could cost the Gunners up to £27m including add-ons.
It was an acrimonious departure from Brighton for Trossard, who had been banished from training after a falling out with manager Roberto De Zerbi.
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Trossard has made three appearances for Arsenal since joining the club, with his full debut coming in the FA Cup third-round defeat to Manchester City.
The winger is still waiting for his first goal for the club and former Arsenal captain Gallas is unsure if he will turn out to be a success at the Emirates.
He told gentingcasino: "I don't know if Leandro Trossard is a good signing.
"He has a big profile like his fellow teammates but the question is, can he lift his level at a big club?
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"If it's a good signing, he will help take Arsenal to victory.
"When you bring players to a big club, they have to play really well, so we need to wait and see what happens."
Trossard was 'desperate' to join
Arsenal made a move for Trossard after failing in their bid to sign Mykhailo Mudryk, who joined rivals Chelsea instead from Shakhtar Donetsk.
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Speaking last month, Arsenal boss Mikel Arteta said he was delighted to have signed Trossard.
"He's a player that will give us a lot of versatility, a lot of quality and composure in that final third. He knows the league, he was available to come, he was desperate to come," said Arteta.
"We welcome those type of players to the club."
Meanwhile, Gallas believes Mudryk could regret joining Chelsea over Premier League leaders Arsenal.
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"Mudryk may have made a mistake, he had the opportunity to play for Arsenal," added Gallas.
"The way Arsenal play, he would have fit into that squad and at the end of the season, he may regret it. What if Chelsea do not qualify for the Champions League?
"Arsenal may be the champions in the end. At the end of the season, maybe he will regret it. It could have been an opportunity for him to play well and in the Champions League next season.
"However, Arsenal will have to move on, and now they will have the chance to bring in new players so that they can play with the players they want."
Topics: Arsenal, Chelsea, Football, Transfers, Premier League