The midfielder hasn't had any competitive action since damaging cruciate knee ligaments playing against Watford back in December last year.
Gundogan has been able to pass and shoot for a few weeks but City have been careful not to include him so far in any full-contact sessions.
It's understood the Germany international will now take the last step but City's medical staff first want to see how he physically reacts to being a part of the main group once more.
The 26-year-old is targeting a Premier League return at the beginning of next month and the friendly game in Girona next Tuesday is seen as an ideal game to ease him back in.
City have formed extremely close ties with the newly-prompted La Liga club, which has already seen Pablo Maffeo, Aleix Garcia and recent Brazilian signing Douglas Luiz join them on loan for the coming season.
Gundogan has quickly proved popular with City supporters since arriving from Borussia Dortmund last summer for £20million, scoring twice in the famous Champions League victory over Barcelona, and Pep Guardiola still sees him as a vital cog in his engine room.