Florentino Luis has signed a new contract with Benfica, which doubles his release clause from €60 million to €120m (£107m/$136m).
The highly-regarded defensive midfielder had emerged as a summer transfer target for Manchester City and Paris St-Germain but will instead stay with the Portuguese champions.
Benfica had been concerned about the prospect of losing Florentino ahead of time, with his release clause set tantalisingly low, but succeeded in agreeing terms with the 19-year-old on the first day of pre-season, July 1.
Forward Joao Felix will join Atletico Madrid imminently, the club who earlier this summer met his €120m release clause, and Benfica were determined to hang on to their other academy crown jewel this summer.