Mykhailo Mudryk was taunted by fans for his decision to join Chelsea over London rivals Arsenal in January.
The 22-year-old was whisked away to Stamford Bridge for a £88m by world football's biggest spenders, after weeks of discussions with the Gunners.
Mikel Arteta's side grabbed Leandro Trossard in their dip back into the transfer bag, while Chelsea - who thought they had recruited a readymade star - were left regretting their purchase.
Indeed, in the view of a few Gunners fans Mudryk will also be ruing the commitment, having won just three league games since arriving in the Premier League.