United have been in fine fettle under Ole Gunnar Solskjaer, who was placed in interim charge until the end of the season in December.
However, after a sparkling run of form, the Norwegian is now the favourite to land the full-time position.
A 12-match unbeaten streak in the Premier League was brought to an end by Arsenal at the weekend after a 2-0 victory at the Emirates.
But a fine FA Cup run and a brilliant performance in the Champions League has more than made up for it.
Despite being 2-0 down, United turned around their European tie with Paris St-Germain to win 3-1 at the Parc des Princes and go through to the next round.
And in the FA Cup, the Red Devils have looked formidable too – knocking the likes of Arsenal and Chelsea out.
It has set up a quarter-final tie with Wolves, who have looked decent against top opposition this season.
United have a number of players ruled out with injury, with Jesse Lingard, Alexis Sanchez and Juan Mata all ruled out.
And Solskjaer’s task has been made harder by the fact Lukaku is now facing a spell on the sidelines, according to The Sun.
The Belgian has just began to hit a hot run of form at a time when it looked like he had won his spot back in the first team.
The former Everton star scored three consecutive braces, including in the Champions League against PSG.
Lukaku had been fighting for a place in Solskjaer’s side after tremendous form from Marcus Rashford as No.9.
But the 25-year-old had found joy playing on the right-hand side of a three-pronged attack.
The other man involved is Anthony Martial, who United fans will be happy to see back in the side.
The Frenchman was back in the squad last week against Arsenal and is expected to be back to fitness this weekend.