Benfica intend to tie in-demand midfielder Florentino Luis to a new contract when he returns for the pre-season programme on July 1 in an effort to stave off interest this summer, but could face fielding bids before they have the opportunity to do so.
Manchester City and Paris Saint-Germain are long-standing admirers of the 19-year-old while Roma, under new manager Paulo Fonseca, were credited with interest in recent days.
The Portuguese champions are already braced for bids from interested parties but want Florentino to sign a new contract as soon as possible in order to raise his buyout clause.