Thomas Tuchel must keep Chelsea promise to avoid repeating £20m mistake amid FA Cup warning
Chelsea have been left to rue the decision to sell Marc Guehi following the 21-year-old's metamorphosis into one of England's leading centre-halves. The Cobham graduate, who swapped Stamford Bridge for Selhurst Park in the summer for a deal worth just £20 million, was one of many departures that funded a £110m windfall that secured the services of Romelu Lukaku.


