all I can say is type salary sport Derby County wages into google and I'd say the figures given are realistic, though whether they are accurate who knows? There may well have been a contract extension or a renegotiation after the takeover.

Quantuma were selling only when required, they did after all have to keep the club functioning, plus a player either agrees to a transfer or doesn't and I doubt Sibley was one of the higher earners in the championship.