Alexis Sanchez admits concern amid the struggles with Manchester United

The striker is determined to show his best at Old Trafford, where the former star of Arsenal struggled to find his best shape

The Manchester United striker Alexis Sanchez has admitted he has not brought more joy to the Premier League club and his fans have left him worried.

Sanchez has struggled for form and fitness since he came from the Arsenal rivals in January of last year, with the thirty-year-old who scored only five goals as a United player.

Goalkeeper manager Ole Gunnar Solskjaer said he can not help Sanchez after the disappointing performance of former Barcelona in a 2-0 loss to Paris Saint-Germain in the Champions League.

And ahead of the fifth FA Cup round of Monday with Chelsea, Sanchez said he was determined to show his best at Old Trafford.

"He (Solskjaer) has not told me much about what I have to do on the pitch, but I think I'm an expert player and I think I know what I have to do and what I should not do," Sanchez said at the BBC .

"I'm a player who, if I'm not in contact with the ball, I lose that spark, and sometimes I want to play in every game, you're in, you're out, and I'm used to playing.

"It's not an excuse because if I go on for 10 or 20 minutes, I have to perform because it's what I'm here for, to make a difference.

"I would like to have brought more joy to the club, yes, it worries me because I believe in my ability as a player, I want to prove it".

The international of Chile also made it clear that it still has the impetus to perform at a high level.

"I do not know how people see me, but football is what I loved from being a child and it's my passion," added Sanchez.

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After being subdued after replacing the injured team-mate Jesse Lingard on the stroke of the interval, the former Barcelona star and Arsenal admitted that he knocked after an assistant referee met him while he was warming up during the Champions League match against PSG, although he was quick to minimize the impact on his performance.

"The assistant referee, when we had a counterattack, flew along the line, and I got my foot there and crashed into me, Bang," Sanchez said.

"And I came back in a dugout and I said [reserve goalkeeper] Sergio Romero: "I was beaten and I'm about to move on". I have bruises but it is not an excuse for not being in my game the way I am normally. "