Manchester City manager Roberto Mancini wants to make two more signings before the transfer deadline as he tries to turn his team into serious contenders for the Premier League title. Mancini has already spent £51 million ($83.7 million) since the end of last season after splashing out on Argentina forward Sergio Aguero, French left-back Gael Clichy and Montenegro defender Stefan Savic. But the Italian believes his squad still needs further improvements before they are ready to challenge English champions Manchester United and make an impact in the Champions League. \"Sergio is another striker, a young one. We needed a player like him and he can make a difference,\" Mancini told The Sun. \"But if we want to compete with all the other top teams at home and in the Champions League, we will need other players. \"We are working on this. We need someone in the middle and the right wing. One midfielder and one winger.\" Aguero cost £38 million and there is every chance Mancini -- backed by City\'s Abu Dhabi-based owners -- will spend big again as he eyes the likes of Arsenal winger Samir Nasri and Inter Milan forward Samuel Eto\'o. Inter are also interested in signing City captain Carlos Tevez, who wants to quit Eastlands for personal reasons, but Mancini expects the Argentine back in training next week. Mancini added: \"Carlos will remain a full part of the squad. He comes back from holiday next week. I don\'t know about a deal with Inter.\" If Tevez does stay he would link up with Aguero in a formidable forward line, but City\'s new signing isn\'t bothered whether his compatriot stays or not. \"We are good friends and play together in the national team but whatever he does is up to him, I just want to concentrate on playing here,\" Aguero said. \"If he is here, then that is great. If not, then I will adapt without him. Who is here and who is not does not matter, what is important is that I become part of the team. It is easy to adapt these days.\" Aguero won\'t play for City in this weekend\'s Dublin Cup friendly tournament as he adjusts to his new life, but he has already been impressed by the club\'s appetite for success. \"I was very interested in playing here as it\'s a growing club and I hope that we can grow together,\" he said. \"I think we have great players and a great team. I am playing at one of the best English teams at the moment and there are many things that can be achieved. We can win many titles and hopefully it will be a top year for us.