Not sure if mentioned, but he owes Sporting 13.8 million, so whoever signs him could potentially have to pay that as part of any deal.
"At the end of that season, Gianluca Di Marzio recounts, Sporting failed to qualify for the Champions League, infuriating their supporters. Around 50 hooded ultras broke into their training centre and allegedly attacked the coach Jorge Jesus, his staff and the first team. Leao, like many of his teammates, unilaterally terminated his contract with Sporting after this incident.
Lille took advantage of the situation and snapped him up on a free transfer. A year later, he was sold to Milan for around €30m.
Sporting were furious with the situation and took their former players to court. The Court of Arbitration sided with the Portuguese outfit and ruled that Leao would have to pay the club €16.5m for his conduct. The winger attempted to appeal but this was denied, upholding the original verdict."