The latest reported transfer interest from Everton would see Sheffield United get a cash windfall.
Birmingham signed Adams from the Blades in the summer of 2016, back when the latter were still in League One. Sky Sports reported in January that United inserted a 20 percent sell-on clause into that deal.
They could therefore receive a sizeable fee should Adams leave St. Andrew’s. Not for the first time either, as according to the BBC the Blades got 10 percent each of Kyle Walker’s £45m move to Manchester City and Harry Maguire’s £17m move to Leicester City in 2017.
How much will Adams go for?

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With 22 league goals this season, Adams is regarded as one of the most promising talents outside the Premier League.
He was named in the Championship team of the year for 2018/19 and was shortlisted for player of the year.
This isn’t the first interest Birmingham have received offers from the top flight, either. The same Sky Sports report claims Burnley made four attempts to sign Adams in January. The final bid was for £12m.
Southampton also showed interest in signing Adams, but Birmingham managed to keep hold of their prize asset.
Whether that would remain the case this summer is doubtful; especially if a team like Everton made a move.
However, they would probably have to improve on the £12m bid the Clarets made. The biggest transfer from the Championship to the Premier League last season was James Maddison’s £20m (BBC) switch from Norwich City to Leicester.
Maddison had also just been selected in the team of the year. If Adams is to be sold the fee is likely going to need to be in that region.