Mikel Arteta says that he does not know if William Saliba will be fit to play for Arsenal before the end of the season.
The 22-year-old centre-back has missed four games since he picked up an injury in the Gunners' penalty shootout defeat in the Europa League to Sporting Lisbon in March.
"With William we have to wait a little bit more," the Arsenal manager said.
"He is not progressing as quickly as we had hoped. It is a bit delicate."
Arteta added: "We want to be very certain when we push him that he is ready to absorb the load and with the risk we would take at the moment that is not possible to do.