Ibrahimovic and Rojo returned from serious knee injuries sustained last season and started on the bench for an nearly full-strength United squad.
Zlatan didn't score any of United's four goals but everyone associated with the Red Devils is just delighted to see him back in action.
Ibrahimovic returned after a seven-month absence with a cruciate knee ligament injury to make a substitute appearance for United in their 4-1 win over Newcastle on 18 November. "This week the manager (Jose Mourinho) has been very happy because he has a full team... he knows what he is doing, even when the number of players are limited because he's a victor and has been winning every season", added the Swede.
"I think that's the most important goal in that 4-1 victory".
The result meant Mourinho came out victorious from his first meeting with old adversary Rafael Benitez in a decade.
Death of Border Patrol agent in Texas may have been assault
The second injured Border Patrol Agent is now in a local El Paso hospital's intensive care unit (ICU) in stable condition. The region's mountains and the Rio Grande make it a hard area for people to cross illegally into the US from Mexico.
The Sky Sports commentator also talked about whether Zlatan and Lukaku could possibly play together, and then about the Swede's role, by stating: "I don't think they can play together as a front two". I blame - in the positive sense - Benitez.
"Forwards are a little bit different, forwards have to be that little bit more selfish about what you need to do for the team, it has to be a bit about you, because that's where you get your confidence, you win the games".
"The goal was like a wake-up call and the team reacted very well".
Benitez played down the past rivalry between the two managers to focus on his side, who after an encouraging start to the campaign have now lost three in succession.
"I think we can chase City, why is it not a possibility?" Those close to me know what I have been doing - I was working five, six hours a day. I don't know what the future brings but what happens happens.
Newcastle: Elliot, Yedlin, Lejeune, Clark, Manquillo, Ritchie (Aarons, 66 mins), Hayden, Shelvey, Murphy, Gayle (Diame, 77 mins), Joselu (Mitrovic, 72 mins).
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