Alan Smith's comeback from serious injury has been a major factor in Manchester United's treble challenge, according to manager Sir Alex Ferguson.
Smith should be fit to face Middlesbrough on Saturday
Smith, 26, has been in impressive form for United since returning from a broken leg suffered 14 months ago.
"He has been absolutely unbelievable," said Ferguson. "His form in the last three games has been outstanding.
"He has brought a freshness and an infectious enthusiasm which is spreading throughout the team."
Smith was a surprise inclusion in the Champions League quarter-final second-leg meeting with Roma on 10 April.
But the former Leeds striker took his chance by scoring in the 7-1 thrashing of the Italian giants.
Smith then followed up that display with good performances in the victories against Watford and Sheffield United as United kept up their hunt for the treble.
They remain top of the Premiership, are through to the FA Cup final against Chelsea, and will play AC Milan in the Champions League semi-finals.
"When you think of what he has been through, how he has handled it and the way he is approaching his football, he has been first class," said Ferguson.
"I cannot speak more highly of him than that."
Despite three games in a week so soon after his comeback, Ferguson expects Smith to be fit for the Premiership game against Middlesbrough on Saturday.