London - Arsenal could be without Alexis Sanchez for the trip to Manchester United next weekend after he sustained a calf injury during training with Chile.
The 27-year-old forward has made an impressive start to the season for the Gunners, contributing eight goals and seven assists in 13 appearances across all competitions.
Sanchez linked up with La Roja for their World Cup qualifiers against Colombia and Uruguay, but his participation is looking unlikely after picking up a muscle strain in training on Tuesday.
The Football Federation of Chile issued a statement on its official website, which read: "The medical staff of Chile's national team would like to inform that Alexis Sanchez has a low grade muscle injury.
"He will remain in Santiago, under treatment and his participation for Chile against Uruguay will be evaluated."
Sanchez featured in the north London derby against Tottenham on Sunday, which ended 1-1, and Arsene Wenger will be keeping his fingers crossed that the Chilean star will recover in time to face United on November 19.
Chile have won the last two Copa Americas but will be hoping that Sanchez will be declared fit for the Uruguay encounter to help La Roja reverse their poor form in World Cup qualifying that has seen them win just four out of 10 games so far.