Lazio president Claudio Lotito says Sergej Milinkovic-Savic won't be sold for less than €50m.
The Serbia midfielder is again being linked with Manchester United this week.
Lotito declared: "50 million for Milinkovic-Savic? I won't sell him at that amount, he is worth much more.
"Our market is complete and finished also because Luis Alberto will also remain.
"I quickly kept all the promises I had made. They were taken, all the reinforcements requested by (Maurizio) Sarri on the shopping list."