Karetsas, whose contract at Genk runs until 2029, is regarded as one of the brighter talents in European football, though he would represent a long-term project rather than a player able to make an immediate impact for the Rossoneri.
Tactically, he is a creative, ball-dominant attacker whose dribbling and passing draw comparisons to Paulo Dybala, operating primarily from the left before cutting inside to look for the best attacking option. Getting the tactical framework right, along with a physical development programme, will be key to unlocking his long-term potential.
The Karetsas link comes as Leão's situation continues to dominate the conversation in AC Milan. The Portuguese forward is ready for a new challenge, and the club are prepared to listen to offers for him this summer.
Nothing has been signed between Leão and agent Jorge Mendes, but a verbal understanding is understood to exist between owner Gerry Cardinale and Mendes to explore an exit. Milan's plan is to resolve Leão's departure first before turning their attention to a direct replacement.
Adding to the picture, sources in Germany report renewed Italian interest in Eintracht Frankfurt's Can Uzun, with Napoli and Milan both said to admire the Turkish international, who featured at the World Cup under Vincenzo Montella.
The stumbling block is price: Frankfurt have set a base valuation of €45m for the 2005-born attacking midfielder, a figure bolstered by reported interest from the Premier League and Galatasaray.
Uzun registered 10 goals and six assists in 28 appearances across all competitions for Frankfurt last season, and won his first cap for Turkey in a pre-World Cup friendly against North Macedonia, scoring in the process.
Galatasaray are considered optimistic about bringing him back to Turkey despite the price tag and the competition from Serie A, leaving Milan with plenty to weigh up as they map out their attacking options for the season ahead.