Munich: Bayern Munich head coach Pep Guardiola has returned to work with his team and predicted a difficult season up ahead, in which the German football giants aspire to win the Bundesliga for the fourth consecutive time.

“No team has ever won the Bundesliga four times in a row,” Efe quoted Guardiola as saying on Thursday during the Spaniard’s first post-summer vacation press conference.

Several teams represent a challenge against Bayern for next season, the Spanish coach said, listing teams such as Borussia Dortmund, Borussia Monchengladbach, Bayer Leverkusen and FC Schalke 04.

“Dortmund has a new coach and that could give them a boost. Gladbach are now coming to show their capabilities. Leverkusen has a second season with (coach Roger) Schmidt who now knows his players better. Wolfsburg had a great season and Schalke need to come back,” Guardiola added.