Bayern Munich winger Arjen Robben is unlikely to return from a month-long injury lay-off in time for Sunday's Bundesliga clash with title rivals Borussia Dortmund, according to coach Pep Guardiola.

"Arjen has not yet trained with us. He's in the final phase of his recovery process, but I don't know if he will be able to play on Sunday," Guardiola said at Friday's press conference.

Robben, 31, is working his way back from a groin injury sustained in the Netherlands' 1-0 Euro 2016 qualifying loss to Iceland on September 3.

Guardiola said midfielder Arturo Vidal will be available though with the Chilean having fully recovered from a knee problem that kept him out of Tuesday's 5-0 demolition of Dinamo Zagreb in the Champions League group stage.

The Spaniard added that full-back Juan Bernat had also overcome a knock that forced him off at half-time in midweek.

Bayern go into Sunday's showdown against Dortmund at the Allianz Arena with a four-point advantage over Thomas Tuchel's side after recording seven straight wins to start the season.