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Swansea and Newcastle are both keen on the exciting 20-year-old, who is valued by Anderlecht at £15m.

Anderlecht will sell but the Serbia international wants to play Champions League football and is understood to be asking for wages of around £60,000 a week plus bonuses.

Chelsea boss Jose Mourinho wants to boost his strike force, and is also looking at Barcelona's Spain star Pedro.

But Mitrovic, seven years younger than Pedro, is more in line with the sort of young forward boss Jose Mourinho wants as back-up to lead striker Diego Costa and loan signing Radamel Falcao.

The Blues watched Mitrovic throughout last season when he scored 23 goals in an impressive campaign.

With fellow Serbs Nemanja Matic and Branislav Ivanovic already in the Chelsea squad, Mitrovic should have no trouble settling at Stamford Bridge.

Arsenal, Liverpool and Manchester United are also well aware of Mitrovic's talents but it is understood Chelsea have now stepped up their interest, with the Pedro deal in doubt due to Barcelona's club elections.

Presidential candidate Joan Laporta has insisted he wants Pedro to stay if he is selected again, increasing the prospects of Mitrovic joining the champions.

Mourinho is well aware he needs to boost his squad with rivals Manchester City and United investing so heavily this summer.

He is also thought to want a new central midfielder and centre-back and, despite claims to the contrary, may be willing to listen to offers for Brazilian Oscar and Colombian misfit Juan Cuadrado to boost the funds available to make signings.

Striker Loic Remy could also be dumped if Mitrovic arrives as, although he performed well last season, there are concerns about previous injuries.

Mourinho is also believed to be keen to take a young striker and mould him into a top performer, in contrast to what he will have to do with Colombian Falcao, who needs to prove himself again after a dismal season at Old Trafford.