Arsenal's defensive injury woes have taken another concerning turn after Cristhian Mosquera was forced off during Monday night's Premier League fixture at Aston Villa, raising fresh fears for manager Mikel Arteta just days before a crucial home meeting with Chelsea at the Emirates Stadium.
The Spanish defender was seen clutching the back of his thigh after going down without contact in the second half at Villa Park, immediately sparking concern among the travelling Arsenal supporters. He was unable to continue and was replaced by Ezri Konsa, who received a warm reception from the home crowd on his debut appearance.
Despite the alarming manner of the substitution, Arteta sought to downplay the severity of the issue after the final whistle, though he confirmed Mosquera had sensed something wrong before being withdrawn as a precaution.
"He is fine," Arteta explained. "But he was feeling like he was about to have something. He could not continue. That's why we have the bench that we have, that's why we had to bring Ezri on."
The timing of the scare could hardly be worse for Arsenal, who are already contending with the absence of several key defensive figures. Mosquera now finds himself in a race against the clock to prove his fitness before Sunday's high-profile derby against Chelsea, a match Arteta will want to approach with his squad as close to full strength as possible.
The situation is made more pressing by the continued unavailability of William Saliba, whose long-term back problem shows no sign of resolving quickly. The Frenchman played through discomfort for months before it flared up severely during France's World Cup semi-final appearance, a issue their national team manager Didier Deschamps described as "unbearable" during the tournament.
Arsenal have since clarified that Saliba's condition will not require surgical intervention, opting instead for an extended rehabilitation program at the club's training facility. A statement issued last month outlined the club's approach: "Specialist reviews on William's return to London this week have confirmed that he has suffered a back injury which will require a period of rehabilitation. Extensive assessments have concluded that surgery is not recommended, but William should now commence a managed recovery programme."
The statement continued: "William's rehabilitation will commence immediately, with continual management of his injury, and he is expected to be out of action for an extended period." Current projections point to a possible return sometime in the winter of 2026, leaving Arteta without one of his most trusted centre-backs for a significant stretch of the campaign.
Adding to the club's defensive concerns is the ongoing absence of Jurrien Timber, who has not appeared in a competitive fixture since a late substitute appearance in last season's Champions League final. The Dutch international had struggled with a groin issue in the lead-up to that game, an injury severe enough to rule him out of World Cup contention as well.
Timber subsequently underwent minor surgical treatment during the off-season but has yet to rejoin full first-team training sessions. Arteta's most recent assessment, delivered roughly two weeks ago, indicated the defender remained several weeks away from returning to group work, with a realistic comeback now pencilled in for September or October of 2026.
With three defenders in various stages of injury and recovery, Arteta faces mounting pressure to manage his limited resources carefully as Arsenal navigate a demanding fixture schedule, starting with Sunday's derby test against a Chelsea side eager to exploit any defensive vulnerabilities at the Emirates.
Based on reporting from standard-football.