Second division Italian team Livorno have retired the number 25, worn by Piermario Morosini before he died of a heart attack.
The 25-year-old was on loan from Udinese when he died during Saturday's Serie B match at Pescara.
He had only joined the club at the end of January but Livorno announced on their website on Monday that the number 25 will no longer be used, as a mark of respect.