The Chilean has struggled to find his best form this season.
The Chile international limped off at Norwich City earlier in the campaign, picking up a hamstring injury that saw him miss two months of the season.
He has struggled to hit his best form against since, as his and Arsenal’s season has come to a disappointing conclusion.
And he has admitted that fear of getting injured once again has seen him struggle to recapture the performances that saw him set the Premier League alight last year.
“Before my injury I was 100 per cent fit. I was feeling well. After the injury I wanted to get back but it was hard,” the Daily Mail reports him saying.
“I had a setback and when I played a match, I was scared I would get injured again because the thing I like most in the world is playing football and when I can't play, I feel sad.”
The Gunners will now be hoping Sanchez can find his best form between now and the end of the season as they look to mount a late title push.
They are currently 11 points behind leaders Leicester City with a game in hand, with many believing the title race is now a foregone conclusion.
The Gunners hopes of finishing first are not over until it is mathematically guaranteed though, and they will need Sanchez at his best to ensure the title race lasts as long as possible.