Sergej Milinkovic-Savic's agent has said there is "enormous interest" in the Lazio midfielder amid speculation linking him with Manchester City, Manchester United and Real Madrid.
Serbia midfielder Milinkovic-Savic has scored nine goals in 24 Serie A games this season and Lazio's sporting director, Igli Tare, said at the weekend that a €70 million bid had been turned down in the summer.
And agent Mateja Kezman told Tuttomercato that some of Europe's top clubs were eager up to sign him.
"There's enormous interest in him from big clubs in Italy, England, Spain and France," he said.
"I don't want to mention figures, but certainly Sergej has the potential to be the best player in Europe in the coming years.
"We'll talk about a transfer at the end of the season, though. Lazio are playing a great season and we're all focusing on this."
Until joining Lazio in 2015, Milinkovic-Savic was represented by Bernardo Brovarone, who almost secured him a move to Fiorentina before the Lazio switch.
During negotiations, Brovarone said the player had confided in him that his ultimate goal was to play for Real Madrid.
"I remember when he told me that the main thing for him was that he was getting a regular game now and that after two years as a regular, he would then go to Real Madrid," Brovarone told Tuttomercato.
"You could see that he had ambition and a lot of desire to show what he can do.
"Watch out for the Premier League, though, because I know two big English clubs have had their eyes on him for a while."
Brovarone said whoever ended up signing his former client would have to pay at least double the €70m Lazio were offered in the summer.
"In view of current figures, Milinkovic-Savic is worth in the region of €150m," he said. "I'm sure Lazio will receive offers they cannot refuse for him this summer.
"He's a total midfielder with quality, experience and personality. He scores a lot and is also good with free kicks.
"He reminds me of the early [Paul] Pogba, although he is less showy and has more strength. He's definitely ready for a top club -- there's no doubt about that."