Rodrigo De Paul is on the Udinese bench against Milan, fuelling reports of interest from Napoli, Fiorentina and Atletico Madrid.
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The Argentina international was sensational last season, with nine goals and eight assists in 36 Serie A appearances.
It earned him a call-up to the Seleccion for the Copa America this summer.
The fact he is on the bench in the Serie A season opener against Milan suggests something is in the works behind the scenes ahead of the transfer deadline on September 2.
Interest was known to exist from Fiorentina, Napoli and most recently Atletico Madrid.
Udinese had previously stated they wanted €35-40m for the 25-year-old, who can play in midfield, as a winger or a support striker.