The Premier League club have had the player watched on a number of occasions this season and they look ready to step up their interest in the summer.
Lica has recently been linked with Sporting Braga, but he could find it hard to reject a lucrative offer from England, provided the two clubs can negotiate a transfer fee.
The 24-year-old began his career at Academica, but it was thw impressive showings during the loan spell at Trofense that earned him a switch to Estoril.
He helped the Portuguese minnows gain promotion to Primeira Liga by scoring 12 goals in 29 matches last term and he has continued the rich vein of form in the elite division.
Lica has scored 5 goals in 25 Primeira Liga matches this season and proved he has what it takes to play at the highest level.