United have had a gruelling run of fixtures over the busy festive period, though emerged victorious in all of them, and Solskjaer is keen to get a full week to work with his team.
The youngster came onto the field with Ole Gunnar Solskjaer's blessing for his official debut though fans will remember him first featuring in the club's pre-season tour.
The Norwegian has already revealed that he will be involved in talks over any January transfer targets, and The Mirror reports that he will also now help decide the futures of players soon to be out of contract.
But with nine changes to the side that beat Newcastle United in midweek, United's fourth straight Premier League win since Solskjaer replaced sacked Jose Mourinho, it was an unconvincing display against a side second-bottom in the Championship.
Solskjaer said he is keen to win trophies this season but suggested that the style, for now, was more important. "We kept them at bay then we made some mistakes, the crowd got drawn in and it's always hard".
"It has to start with the way we play because results you can not control", he said.
"And when you win four, you expect to win the next one as well".
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The Blues are now fourth in the Premier League table as they prepare for their home clash against Southampton on Wednesday. We chased the victory and had it in our hands.
Despite enjoying an eyebrow-raising 60 per cent of possession, though, Reading lacked the firepower to really trouble Sergio Romero in United's goal and the visitors will now return to the Madejski to continue their fight against relegation.
"I think the manager he has done a brilliant job".
"But we got the goals and managed to get through". It was about seeing what you can do to go back to the way we used to play, the way Man United are supposed to play, exciting football.
Alexis Sanchez had the first chance of the game, firing just over after 15 minutes following a slick counter from the home side.
But just as Reading's hope began to grow along came Lukaku to extinguish it, keeping his cool when meeting a pass from Sanchez to round Jaakkola and roll into the empty net.
"He's been out a month now, he's had 20 minutes against Newcastle, half an hour maybe".
Mata dispatched a cool penalty - his first FA Cup goal since the victorious final of May 2016 - after referee Stuart Atwell penalised Omar Richards for a foul on the Spain global after a VAR consultation, with Fred's strike having been disallowed for offside in the same move.