Everton are monitoring Porto winger Yacine Brahimi and Sporting Lisbon defender Ruben Semedo, according to the Liverpool Echo.
The Toffees sent scouts to watch the two rivals clash at the Estadio do Dragao last weekend as the home side won 2-1.
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Both players have been linked with Everton in the past and 27-year-old Brahimi looked set to join the club last summer only for a deal worth £33.6 million reportedly collapsing on deadline day.
The Algeria international is a rapid winger and has quick feet, and although he has been quite inconsistent with his performances since a move from Granada in 2014, a move may still excite Toffees fans.
Everton are also keen on improving their defensive line after Phil Jagielka dropped down the pecking order and have identified Semedo as the ideal replacement.
The 23-year-old is seen as a hot prospect in Portugal as he is tall and physically commanding although he still may still need to add improvements to his game if he were to succeed in the Premier League.