Forlan admits frustration

Diego Forlan's career statistics Kleberson's career statistics

Diego Forlan has admitted that he is finding it hard to cope with being a bit-part player at Manchester United.

United are reported to be keen to sell the Uruguay striker, with Spanish sides Sevilla and Real Betis said to be interested in securing his services.

"When you get a run like I did before Christmas, then that stops and you have to come back, it is not easy.

"You play one game, then are out for three or four and sometimes you are sub, it is hard," Forlan told MUTV.

"You have to work hard, try to keep going and be ready for the next time when you have a chance."

Forlan has struggled to make an impact since his £7.5m move from Independiente in 2002.

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He has made just 36 starts for United and is behind Louis Saha and Ruud van Nistelrooy in the pecking order.

The 24-year-old was taken off 55 minutes into the win over Leicester on Tuesday and walked off down the tunnel, a move that angered boss Sir Alex Ferguson.

It has been reported that Forlan could be allowed to leave for around £2m.

United could also be set to cash in on Brazilian midfielder Kleberson, who has made only 14 appearances for the club since a £5.9m move from Atletico Paranaense.

Kleberson - a 2002 World Cup winner with Brazil - has failed to settle in Manchester since his high-profile August transfer.

He dislocated a shoulder in September and has not managed a proper run in the team since.