Victor Lindelof also made his debut, but it was already 3-0 when the duo were introduced, with Marcus Rashford having stolen the show in the first half.
Manchester United, first half: De Gea, Valencia, Jones, Smalling, Blind, Carrick, Herrera, Fellaini, Lingard, Mata, Rashford.
United signed both Lindelof and Lukaku for a combined fee of £100 million but Mourinho is not satisfied with moves for Ivan Perisic and Nemanja Matic set to be completed.
United boss José Mourinho has said it is "possible" Zlatan will be offered a new contract, and the fans have been positively reacting to this development on the club's official social media pages. He was an important first team player in his two-title winning seasons at the club, scoring 7 goals in 157 appearances in that time, and is widely as one of the best enforcers in Europe.
The Red Devils face Real Madrid in the UEFA Super Cup on August 8 before beginning their Premier League season against West Ham United on August 13. He's learning a lot, a great professional, great attitude. We knew he is going to score more goals than last season'.
Swedish star Ibrahimovic was United's top-scorer last season, bagging 28 goals in all competitions.
Mourinho insists that Rashford is not a target man but acknowledged that the youngster has bulked up significantly from the rookie striker who burst on the scene at Old Trafford 17 months ago. Tonight, while he did not seem optimistic about acquiring him, the manager kept the door open. "In every sport, how many times do you play and you're not 100%?"
However, when asked about the likelihood of the move, Mourinho said it can not happen due to the "economic difficulty" of doing the deal.
He added: "It is a question for Florentino".
"Clubs put price tags on players, not the one who wants to buy".
"He belongs to Madrid". After some discussions, however, the young goalkeeper made a decision to renew, which means Real Madrid will have to look elsewhere for their number one. It is simple. It is a shame. Lukaku's strength, size, aerial threat, speed and technical ability make him adaptable to any team's formation needs. We have a special liking for him, he is someone special.
"I enjoyed watching his evolution in Juventus and Madrid". It is like that.
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