Arsenal forward Gabriel Jesus could be out for the rest of the season after suffering a suspected A-C-L injury.
The striker was forced off during the club's penalty shootout defeat to Manchester United in the FA Cup on Sunday.
Arsenal are set to win the race to sign Spain midfielder Martin Zubimendi from Real Sociedad.
The Gunners are reportedly agreeing terms with the Basque club, and will bring the 25-year-old to North London in a deal worth around 60-million euro.
Liverpool and Manchester City were among the other clubs interested in acquiring Zubimendi this January.