Arsenal have signed Leandro Trossard from Brighton, beating out Tottenham and Chelsea.
Trossard becomes Arsenal's first arrival during the January transfer window.
Arsenal had spent much of the window chasing Mykhailo Mudryk but he joined for Chelsea in a €100 million deal instead from Shakhtar Donetsk.
"We are really happy to have him," Mikel Arteta said. "He's a player we have followed for a while now. The opportunity came -- we had the necessity to have a player in the frontline that is versatile enough to play in different positions.
"He knows the league, he has enough experience here and I think he can have an immediate impact in the team.
"We have to think short-term, but as well medium and long-term as well. He gives us all that.
"He's a very intelligent player. When you look at his career and what he's done in the last few years, he's a player that fits our way of playing for sure. We're happy to have him."