LONDON, ENGLAND - SEPTEMBER 24: Arsene Wenger, Manager of Arsenal pats Alexis Sanchez of Arsenal on the back after he is subbed during the Premier League match between Arsenal and Chelsea at the Emirates Stadium on September 24, 2016 in London, England. (Photo by Paul Gilham/Getty Images)

Alexis Sanchez’s former Arsenal coach Arsene Wenger believes his stuttering form at Manchester United is down to a loss of confidence

The Frenchman signed Sanchez from Barcelona in 2014 for £31.7m and soon reaped the benefits of the decision with the Chilean becoming one of the Premier League’s most lethal forwards.

At Arsenal, Sanchez scored 80 times and 166 appearances in all competitions.

However, since making the controversial move to rivals United in January, Sanchez has only found the net four times in 28 games.

And Wenger fears it will take time for his former star forward to recapture his best form.

“I believe he has lost confidence,” Wenger told beIN Sports.

“The strength of Alexis Sanchez is to take initiative to dribble and to take people on.

“Those are the players who are most vulnerable when they lose confidence their game is based on that and having that feeling to take initiative, he has lost that slowly.

“Since the start of the season he had a high level of physical energy but he has lost that as well.

“Certainly he is refreshed now because Mourinho left him out for a while.”

The 68-year-old also shared his views on long-time rival Jose Mourinho.

Sanchez started in United’s 2-1 Champions League win at Juventus on Wednesday.