By Harvey Byrne

Chelsea have submitted a stunning £50million bid to bring Everton striker Romelu Lukaku back to the club, according to a report.

Sky Italy journalist Gianluca Di Marzio has claimed on his website that the Blues have made their first formal move to re-sign the Belgium international.

New manager Antonio Conte has sanctioned the mega Lukaku bid after already completing £30m-plus deals for striker Michy Batshuayi and midfielder N’Golo Kante this summer.

It is thought that if a deal does happen for the Belgian striker then Diego Costa’s situation might evolve with the Spain striker linked with a return to Atletico Madrid.

Everton are now weighing up the Chelsea bid. Toffees manager Ronald Koeman is said to be increasingly resigned to losing Lukaku this summer and the £50million offer could tempt the club to allow the powerful striker to leave.

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The highest transfer fee the Merseyside club have received for a player is the £27.5million from Manchester United for Marouane Fellaini, with the potential Chelsea fee almost double that amount.

Everton’s number 10, who moved to Chelsea from Anderlecht back in 2011, is himself Everton’s record signing, joining permanently from the west Londoners for £28million two years ago.

Lukaku is in demand after scoring an impressive 25 goals in all competitions in what was a disappointing season under manager Roberto Martinez in 2015-16.

The striker struggled for playing time during his last spell at Stamford Bridge and his woes were compounded after a penalty miss in the 2013 UEFA Super Cup final against Bayern Munich, which lost them the shoot out.

In other Everton transfer news, the Toffees have tabled a £46million bid for Napoli defender Kalidou Koulibaly.