GETTY Arsene Wenger is sweating on the fitness of Arsenal stars Alexis Sanchez and Hector Bellerin

Alexis Sanchez suffered a “low-grade muscle injury” on international duty and looks set to miss Chile’s World Cup qualifier against Colombia tomorrow.



And Hector Bellerin reportedly did not complete a training session with the Spain Under-21 side yesterday.



Arsenal take on Manchester United at Old Trafford next Saturday (November 19) and Wenger will be desperate to have the pair available.

REUTERS Alexis Sanchez has scored eight goals for Arsenal so far this season

GETTY Arsenal star Hector Bellerin has suffered an injury scare in training with Spain Under-21s

Alexis Sanchez and Hector Bellerin are injury doubts for Arsenal's clash with Manchester United after the international break

Sanchez was injured during in training and is unlikely to be risked against Colombia, although he has not yet been ruled out of Chile’s home match with Uruguay on Tuesday.



The 27-year-old has scored eight goals in 15 matches for Arsenal, leading the line at the expense of striker Olivier Giroud.



The Chile FA said in a statement: "The medical staff say that Sanchez has a low-grade muscle injury. The player will remain in Santiago under treatment and will be evaluated for the match against Uruguay."

Alexis Sanchez in Chile training before calf injury scare Tue, November 8, 2016 Alexis Sanchez is snapped training with the Chile international team shortly before picking up a muscle tear injury Play slideshow Getty Images 1 of 6 Alexis Sanchez is spotted training with the Chile international squad shortly before picking up a calf muscle tear

Chile are fifth in their World Cup qualifying section of 10 teams, with 16 points from 10 games, five points behind leaders Brazil.



And Bellerin’s scare has given Wenger a double injury headache as he plans for his first clash with Jose Mourinho since the former Chelsea boss joined Manchester United.



Spanish sports paper AS say Bellerin and Athletic Bilbao's Inaki Williams are not 100 per cent fit and trained away from the main squad ahead of Friday’s game against Austria.

GETTY Arsene Wenger will be desperate to have Alexis Sanchez and Hector Bellerin fit at Old Trafford