Rui Vitória has rung the changes for Saturday's visit to in-form Rio Ave. Júlio César, Andrija Zivković and Filip Krovinović return from injury, while Andreas Samaris is back after serving his four-match suspension.

Martin Chrien and Aurélio Buta have both been dropped, with the latter linked with a loan move away from the club. André Almeida has shaken off a knock picked up against former club Belenenses, but Eduardo Salvio has been ruled out with a right knee injury. He joins Álex Grimaldo (right leg), Ljubomir Fejsa (right leg) and Kostas Mitroglou (left thigh) on the sidelines.

Saturday's top-of-the-table clash at the Estádio dos Arcos begins at 20:30 local time.

Goalkeepers: Júlio César, Paulo Lopes and Bruno Varela

Defenders: Lisandro, Luisão, Eliseu, Jardel and André Almeida

Midfielders: Filipe Augusto, Samaris, Krovinović, Pizzi, Willock, Cervi, João Carvalho, Diogo Gonçalves, Živković and Rafa Silva

Forwards: Raúl, Jonas and Seferović