And things have got worse following confirmation that they have been hit by a charge from European football's governing body.
"Charges against FC Basel 1893: Setting off fireworks - Art. 16 (2) of the UEFA Disciplinary Regulations (DR)".
Lukaku has already scored four goals in four Premier League games to help Manchester United hoist themselves to the top of the Premier League table. We don't cry with injuries.
Victor Lindelof is confident of proving his worth at Manchester United after stepping out at Old Trafford for the first time.
The Belgium worldwide, who has also scored four goals in two World Cup qualifiers since the start of the season, has looked every bit the marksman Jose Mourinho wanted when he bought him from Everton for £75million in the summer.
The Frenchman has formed a very smooth partnership with new arrival, Nemanja Matic and Mourinho will now have to look up to the likes of Ander Herrera, Michael Carrick and Marouane Fellaini. They train together always in the same team because I knew that they had to play this match together.
It's a major blow to United's midfield, who don't have anything resembling a like-for-like replacement for the incredibly dynamic Pogba.
Manchester United Midfielder Paul Pogba will undergo a scan later today to confirm the extent of the injury he sustained in their 3-0 champions league opening group game against Basel on Tuesday night. "Big? Small? I don't know, but hamstring for sure".
With both Bailly and Jones available again, Lindelof is set to drop out of the team when Everton visit Old Trafford in the Premier League on Sunday.
Lindelof added: "They are all good players and I think it's easy to play with them all".
Should Mourinho's assessment prove correct, Pogba will also miss league games against Southampton and Crystal Palace, as well as a Champions League game at CSKA Moscow.