By Wayne Veysey

18th Jan, 2020 | 6:30pm

Sources: Everton convinced they're sitting on unexpected '£50m+ goldmine'

Everton are convinced the value of Dominic Calvert-Lewin has rocketed beyond £50million following his recent transformation, Football Insider understands.

The striker, 22, continued his scoring run by netting the equaliser for Carlo Ancelotti’s team in their 1-1 Premier League draw against West Ham today.

An Everton source has told Football Insider the club believe Calvert-Lewin’s valuation has soared in recent months and they’re now “sitting on a £50m-plus goldmine”.

The Goodison Park hierarchy have no intention of allowing Calvert-Lewin to leave this summer amid growing whispers of interest from elite Premier League and European clubs.

But they recognise the former England Under-21 international is developing into a bona fide star of the English game.

Everton rated Calvert-Lewin in the £20-30m bracket but his transformation has led to a surprise climb in his value.

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Former caretaker manager and longstanding assistant coach Duncan Ferguson has been credited for inspiring a major improvement from the young forward.

He has always been highly regarded for his technical ability and all-round play but his finishing and decision-making in and around the box had let him down.

Calvert-Lewin has been far more effective over the last six weeks, scoring six goals from his last eight Premier League matches.

He has a contract that runs until the summer of 2023 and Everton are likely to offer him a new deal over the next 12 months.

Calvert-Lewin joined the Merseysiders from Sheffield United in 2016 for around £1.5million.

He has now played 119 times for Everton, scoring 28 goals and providing 10 assists.

In other Everton news, it can be REVEALED that a club senior attacker has rejected move after Marcel Brands accepts offers.