Manchester United striker Dimitar Berbatov has admitted he is becoming frustrated, with his long-term future still to be decided.

The Bulgarian forward expects to leave Old Trafford this summer despite the club taking up an additional one-year option on his contract back in March.

Berbatov, who joined from Tottenham in a £30.75million deal back in September 2008, has become an increasingly peripheral figure of late.

With Wayne Rooney the undisputed main striker for Red Devils manager Sir Alex Ferguson, both Danny Welbeck and Javier Hernandez have been preferred to Berbatov in the pecking order.

And the 31-year-old admits he has held further discussions with Ferguson over his future, with the Red Devils looking to recoup £5million from his sale.

Berbatov, who scored nine goals in his 21 appearances last term, is unhappy to have read press reports that he is valued at double that amount.

Berbatov wrote on his Facebook page: "Because I am tired of speculation, I am telling you this. I read the papers and I see they say £10million is my price.

"I go and talk with Sir Alex, and he says to me £5million. So who is telling the truth, what do you think?

"And the truth is, I love this club, but I am not going to be useful to anyone, if I am not playing.

"And I want to play, I want to help. But for unknown reasons it's not going to happen, or my chances will be limited, so it's better for everyone if we say goodbye.

"If not, I am professional and I will keep doing everything I can, to help my team and my team-mates, whenever I have opportunity to do so."