That’s the decision of former Southampton celebrity Matt Le Tissier, who now works as a pundit for Sky Sports.
Lukaku hit the bottom operating after arriving at Old Trafford from Everton in a £75m deal over the summer time.
But he’s these days in the middle of a spell which has observed him ranking simply two times in twelve video games.
Lukaku did arrange to bag as United beat CSKA Moscow within the Champions League on Tuesday evening.
And Le Tissier says he must handle that roughly shape or Mourinho will be pressured to bench him.
“He’s got enough goals, perhaps not enough goals against those big boys but enough to justify the money that was laid out for him,” he advised Sky Sports.
“However, with Ibrahimovic coming back it does put that little bit of extra pressure on him so last night’s goal was important because then he continued that run, if not then there’s pressure on Jose to put Ibrahimovic back in that team after what he achieved last season.”
Mourinho will be hoping Lukaku is on goal when United face opponents Manchester City on Sunday.
The Red Devils are these days 2nd within the Premier League, at the back of the Blues.
But they’re already 8 issues adrift of Pep Guardiola’s aspect.
And that distinction method United may see their name hopes dashed in the event that they fail to overcome City.