Lukaku made a blistering start to his United career after his £75million summer move from Everton, scoring ten goals in his opening nine games.
But he has failed to find the net in any of his last seven appearances for the club and – with Jose Mourinho's side winning just one of their last four Premier League matches – the critics have been out in force.
Lukaku has the backing of a club legend in Yorke, though. He maintains the 24-year-old is the perfect man to lead the line for United and is simply being let down by the system Mourinho plays.
"When he came to the football club, I felt we had the right person and I really do feel we have the right striker for the club," Yorke told talkSPORT.
"We lost two big personalities. Zlatan [Ibrahimovic] was a big personality for us and scored a number of goals last season and of course we lost Wayne Rooney, who for so many years has been our talisman.
"We were looking for the right ingredients to come to Man United and I think we have the right player. He got off to the best possible start of any striker – he broke all records coming to the club.
"At international level, he is scoring goals. There might be a little question mark about whether he has done enough against big teams in the Premier League but for what he has done at the football club he has been harshly criticised.
"We have all been there. We all go through droughts. I have never come across any player that hasn't gone through a goal drought.
"It is how you cope and the contribution you give while you are going through a drought. I think he does [contribute]. He makes himself available, he is never shy, he is trying.
"It is not all down to Lukaku himself. Maybe the system we have played against a bigger team, it has not given him the opportunity to score goals.
"When you are playing in that specialist position you need to be provided with opportunities to score goals. You can't do it all on you own.
"He did not have any kind of opportunity against the big teams this season. He has been harshly criticised."Let's