Manchester City manager Manuel Pellegrini warns Chelsea title race is far from over The spirit that Pellegrini described is perhaps best personified this season by Frank Lampard who, as a second-half substitute, scored City's second and was involved in the third. He was also outstanding when Manchester City beat Bayern Munich last week in the Champions League. Lampard is due to join up with his new club New York City next month but it appears increasingly likely that his loan spell at City will be extended until at least the end of January ahead of full pre-season training for the Major League Soccer season. "We are going to talk to all the parties and make a decision in December," Pellegrini said. If all parties agree then maybe we can keep him. For his impact both on and off the pitch, it would appear that Pellegrini wants Lampard to stay for as long as possible. "Maybe at 36 he's not able to play three games in a week, not 90 minutes every game, but he always makes a difference because he's a top player," Pellegrini said. The top players know how to do it. I think Frank is also a great professional and person. He's very happy here in our team. He also enjoys the way we play. We are going to make a decision for him and the club. One concern for Pellegrini was the sight of captain Vincent Kompany limping off with a hamstring injury shortly after City had scored their third goal. Pellegrini denied that the damage had been done in the celebrations but he will be assessed today amid fears that he will miss Wednesday's match against Sunderland when his centre-back partner, Eliaquim Mangala, will also be suspended after being sent off. Of Kompany, Pellegrini said: "We'll see Monday if it's just a cramp or an injury. It was before he was celebrating the goal - he told us a minute before. Pellegrini had no complaints about Mangala being dismissed for fouls on Dusan Tadic and Shane Long but was unhappy at Sergio Aguero's first half-booking for a supposed dive. Replays confirmed that he had clearly been fouled by Jose Fonte and that Manchester City should have had a penalty. "I was sure Sergio never dived," said Pellegrini. He doesn't try to cheat the referee. He wouldn't have done it that way. Ronald Koeman, the Southampton manager, suggested that referee Mike Jones did not give the penalty because he had just wrongly booked Victor Wanyama and, perhaps subconsciously, was balancing things up. Southampton have now slipped to third in the Premier League table ahead of fixtures on Wednesday against Arsenal and then Manchester United next Monday. Koeman told his players that this performance was "not good enough" but contrasted his squad size to that of City's after losing midfielder Morgan Schneiderlin at half-time to a thigh injury. Jack Cork had also pulled out shortly before the game through illness while a third midfielder, James Ward-Prowse, is also out due to a fractured foot. "We don't have 24 players like they have to change in the second half," said Koeman. We know that but, if you do these kind of mistakes you will be punished. They showed us that difference. We had good possession but didn't create a lot of opportunities. I think maybe two or three players reached the level they can show.