According to talkSPORT journalist Alex Crook, Coventry sold their clause to Sporting last summer, as they funded a transfer overhaul. They spent £18m ($24m) to strengthen their squad, and it now appears that part of that was paid for by Gyokeres' clause being waived.
DID YOU KNOW?
The sell-on clause was reported to be worth 10 per cent of any deal, so Coventry face missing out on a substantial windfall. Gyokeres made 116 appearances for Coventry, scoring 43 goals.
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WHAT NEXT?
Gyokeres will hope to complete a move away from Sporting in the coming months. He appears poised to end up in the Premier League.