With second-placed Aberdeen drawing 1-1 at property to Motherwell buy fifa 16 ultimate team coins on Saturday, Ronny Deila's guys took the opportunity to widen the gap at the summit with Leigh Griffiths, Dedryck Boyata and Scott Brown adding to a double from Commons, who was forced to apologise for any verbal spat using the club's coaching employees during Thursday's Europa League defeat at Molde.
Celtic controlled the game in the outset and opened the scoring within the 23rd minute when Griffiths slid a shot past the Luis Zwick following Brown's incisive pass.
John Rankin fired more than for United just prior to the half-hour mark and it proved expensive when Boyata nodded in Celtic's second 5 minutes ahead of your interval.
Deila's side produced it 3 in first-half stoppage time as Commons powered a penalty in to the major corner following a foul on Kieran Tierney.
There was no let-up from Celtic inside the second half, with Commons firing dwelling once again following his corner was not cleared adequately by the United defence.
Jozo Simunovic and Tomas Rogic went close but Brown capped the win using the fifth as his strike deflected in to the back of your net to compound the misery for United, who stay rooted towards the foot of the table with a single win from 12.
City went into the match obtaining scored 11 instances in their preceding two Premier League games however the absence of influential attacking duo Sergio Aguero and David Silva by means of injury was keenly felt throughout a laboured 90 minutes.
Yaya Toure spurned the best two openings with the first half for the visitors however they had been forced to defend following the break, with substitute Jesse Lingard striking the crossbar for United five minutes from time.
Pellegrini's team are back on prime of your Premier League on target difference ahead of Arsenal two points better off than United and the manager claimed it was "easy" to defend with his group stationed increasingly close to their very own penalty location.
"I'm not disappointed for the reason that we did okay in a complicated stadium," Pellegrini told Sky Sports.
"We played improved within the initial half, but as a group we really need to defend at the same time, it is a tactical game. It's easy to defend with 10 players in your box, for me it's not the way to do it but we did properly.
"I don't know if we've got played our ideal. I often read how teams going away and playing tactical are undertaking well - it is all mind games, and despite the fact that it isn't my way of playing we did it this time.
"We have returned towards the prime, which is important."
City had faded as an attacking force by the time Pellegrini made the uncharacteristically pragmatic move of replacing Toure with veteran defender Martin Demichelis in the 77th minute as well as the Chilean explained that his team's carelessness in possession forced a modify in method.
"We lost too numerous balls inside the second half," he stated. "We did not have clear probabilities but we had a lot more attempts than United did.
"It wasn't my intention to play that way second half but United had a lot more of the ball."