Manchester City are keen on Borussia Dortmund left-back Raphael Guerreiro.
The 28-year-old Portugal international is one of several potential first-team options the club are looking into.
Guerreiro has made 189 appearances for Dortmund, scored 34 goals and assisted 37, since joining in 2016.
One source has told Sky Sports News that Stuttgart's Borna Sosa is also on City's list. But another source has indicated he is not currently under consideration.
City are also closing in on the signing of Anderlecht left-back Sergio Gomez. Talks are at an advanced stage but City are yet to put in their formal offer to the Belgian club.
Gomez is considered a development player by City, and the intention is to loan him out to one of the other City Group clubs.
It is not beyond the realms of possibility that he will join Pep Guardiola's first-team squad this season - but City remain focused on alternative first-team targets.
Gomez was on City's radar when they were chasing a deal for Marc Cucurella, who ultimately signed for Chelsea.