The Portuguese international was spotted working alone at Sabener Strasse, per Sport Bild, heightening concerns for manager Vincent Kompany.
The Bavarians have already been hit hard by long-term setbacks to key defenders. Alphonso Davies tore his anterior cruciate ligament while on international duty with Canada, sidelining him for the remainder of the season.
Meanwhile, Hiroki Ito suffered a broken metatarsal during Bayern's recent win over St. Pauli, leaving Kompany with a depleted backline.
If Guerreiro joins the casualty list, Bayern may turn to Josip Stanisic or Sacha Boey to fill the left-back role against Augsburg. Both players are more accustomed to the right flank, but Kompany's options are dwindling fast as the Bundesliga leaders push to maintain their strong form under his guidance.
Elsewhere at the club, the future of veteran star Thomas Muller remains a hot topic. Reports have swirled that the 35-year-old's contract, due to expire this summer, might not be renewed, potentially marking the end of his storied career with Bayern.
However, former teammate Franck Ribery has urged the club to keep Muller in the fold.
"Personally, I hope he can stay at Bayern for another year," Ribery told Sport Bild. The French legend, who played alongside Muller for 11 years, recalled his own late contract renewal in May 2018, which allowed him one final season with the Bavarians. "It was the same situation," he added.
Ribery argued that Muller's value goes beyond minutes on the pitch. "Thomas is very important for the dressing room, he has a big influence. He is important whether he plays 90 minutes or five," he said.
"Thomas has done so much for the club, for the city of Munich. If he wants to play another year, then the club should give him this contract."
With Bayern battling injuries and contract dilemmas, Friday's trip to Augsburg looms as a test of their depth and resolve. Kompany will hope his squad can adapt, while Muller's future continues to stir debate among fans and pundits alike.
Bayern Munich are gearing up for a high-stakes Bundesliga showdown against Borussia Dortmund on Saturday, but they'll face their rivals without several key players, according to head coach Vincent Kompany.
As Bayern Munich prepare to face Borussia Dortmund in this season's second Klassiker, Harry Kane has opened up about the dangers BVB pose and why Bayern can beat them.
Tottenham Hotspur battled to a 1-1 draw against Eintracht Frankfurt in the first leg of their Europa League quarter-final, leaving the tie hanging in the balance ahead of the return leg in Germany.
Borussia Dortmund have firmly shut down rumours that their young star Jamie Gittens is looking to leave the club.
