The 21-year-old, who has been linked with Arsenal, West Bromwich Albion and Stoke City, has scored five times and provided four assists in 23 Serie A appearances this season.
A host of clubs have been linked with a move for the Czech Republic international this summer, and the central midfielder has conceded that he wants to leave Italian football.
"For a long-term future I don't see myself still in Italy," Jankto told Tuttosport. "I'd like to try new experiences, maybe in the Premier League or La Liga."
Jankto joined Udinese from Slavia Prague in 2014, but spent last season on loan with Serie B side Ascoli.