By Dominic Toner

Alexis Sanchez is facing a spell out on the sidelines through injury – and Arsenal fans have reacted with panic on Twitter to the news.

CNN Chile claim claim the forward reported for international duty before leaving training with his national team early on Tuesday afternoon to undergo medical tests for a suspected torn calf muscle.

It is said that there has not yet been a definitive verdict but Arsenal will be braced for what could now be a devastating blow to one of their star players.

Sanchez will be a huge blow to the Gunners if he faced an extend period out of action after a strong start to the season.

The 27-year-old has made 15 appearances in all competitions, scoring eight goals and supplying seven assists.

Arsenal supporters expressed their disbelief with the Sanchez news and are praying that the injury is not too damaging.

Here is a selection of their messages on Twitter:

Arsenal have enjoyed a strong start to the season and are only two points behind league leader Liverpool in fourth-place, with Sanchez being used in a different role this campaign.

Arsene Wenger has decided to use the Chilean international to spearhead the attack and he is currently keeping Olivier Giroud out of the starting XI.

Sanchez has predominately played as a left winger during his career and has been phenomenal since his switch as the central striker.

The ex-Barcelona winger has become a firm favourite since he arrived at the Emirates and has made 108 appearances for the club, scoring 50 goals and supplying 30 assists.

In other Arsenal team news, their star player of the 2015/16 season feels the team have moved on without him.