Arsenal forward Eddie Nketiah is still several weeks away from recovering from an ankle injury he picked up earlier this month, says boss Mikel Arteta.
The 23-year-old scored six goals in 12 games before he was sidelined with the injury.
"It was a nasty injury and he has a big challenge ahead of him," said Arteta.
But Gabriel Jesus' return is a welcome boost as the Gunners prepare for a Europa League last-16 second leg against Sporting Lisbon on Thursday.
Brazil forward Jesus returned as a substitute in Sunday's 3-0 win over Fulham, coming on in the 77th minute, after a spell out with a knee injury sustained at the World Cup.