After their home humbling by Champions League opponents Bayern Munich and publicly criticising president Joan Laporta, Koeman's future at Barca is on shaky ground.
Indeed, it's been suggested Koeman has the next three LaLiga games to save his job.
Guardiola urged Laporta at the end of last season to stick with Koeman.
Barca return to action tonight in the LaLiga against Granada - their first appearance since the Bayern thumping.
Guardiola is close to Laporta, having been given his coaching break by the Barca president during his previous time in charge of the club. Guardiola would have a year in charge of Barca B before being promoted as first team coach.
- updated September 20
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