Vincent Kompany
Kompany could face a spell on the side lines with a suspected groin injury. (Reuters)

Manchester City may consider bringing in another defender before the closure of the transfer window after Vincent Kompany suffered a groin injury in their 4-0 Premier League win over Newcastle United.

The Belgian international was forced to limp off in the second half of City's emphatic win on Monday night with what manager Manuel Pellegrini described as a "serious injury" in his post-match interview, a potential headache with the likes of Micah Richards and Matija Nastastic still unavailable.

"I can't say exactly what happened with him. Tomorrow (Tuesday) the doctor will say but I think it is a serious injury, maybe for one or two weeks," Pellegrini said following the game.

The City skipper also expressed his disappointment after the game, admitting the setback was a blow via his personal Twitter account.

Last season's Premier League runners up have already pondered possible additions to their defence before their captain limped off on Monday night. Should Kompany's injury prove to be significant the club may be left with no other opportunity but to consider reinforcements with other central defensive options severely lacking.

Serbian international Nastasic suffered an ankle injury in City's pre-season Barclays Asia Trophy campaign, and while he has returned to training, there is no set date for his return.

Similarly, Richards is also awaiting his return date after picking up a hamstring injury in training ahead of the Newcastle game and is expected to be unavailable for at least two weeks.

Having allowed Kolo Toure to leave the club on a free transfer during the summer, City are left with just Joleon Lescott as their only fit centre half.

The club have been linked with Real Madrid centre half Pepe and Atletico Madrid Martin Demichelis, the latter whom played under Pellegrini at Malaga last season, as possible additions to the City line up before the transfer window closes in just under two weeks' time.

David Silva, Sergio Aguero, Yaya Toure and Samir Nasri all scored last night as City gave Pellegrini his first win at the Etihad Stadium at the first time of asking.

"Always the first match is special. It was very special for me, and very important for the club to win," the City boss said following the game.

"We had from the beginning the attitude to play as an aggressive team, as an offensive team and we continued to attack during the 90 minutes."