Arsenal winger Nicolas Pépé has been diagnosed with a sprained knee and is now a huge doubt for Sunday's meeting with Manchester City.
The Ivorian was forced off in the dying embers of the Gunners' 3-1 win over West Ham with a knee injury and was completely left out of the matchday squad for Thursday's draw with Standard Liège.
He was set for further tests ahead of the City game, but prominent French journalist Manu Lonjon has now revealed that Pépé has suffered a sprained knee, putting his participation in the weekend's clash in jeopardy.
Pépé will now undergo even more examinations to determine the severity of the sprain, with the Gunners eager to figure out just how long he will be on the sidelines for.
News of the injury will come as a huge blow to Pépé, who has endured a challenging start to life at the Emirates Stadium.
When it comes to replacing Pépé, interim manager Freddie Ljungberg will likely be forced to turn to some of his younger stars. The likes of Reiss Nelson, Emile Smith Rowe and Gabriel Martinelli are all pushing for minutes, while 18-year-old Bukayo Saka was again impressive against Standard.
Alongside Pépé, Arsenal will conduct late tests on a number of senior players, in the hope of being at their strongest when they meet City on Sunday.
Héctor Bellerín and Rob Holding are both hopeful of featuring, but the Gunners will certainly be without Dani Ceballos, Kieran Tierney and Granit Xhaka - a situation which Ljungberg admitted to be struggling with.
Victory over West Ham was Arsenal's first since early October, and it saw them climb up to ninth in the Premier League standings.