Champions Bayern Munich staged a stunning second-half comeback to beat Mainz 05 in a seven-goal thriller.

Vincent Kompany's men were 3-0 down at the break after the Bayern boss made nine changes from the midweek win over Bayer Leverkusen in the German Cup semi-finals, with the Bundesliga title already secured following last weekend's win over Stuttgart and with Tuesday's Champions League last-four first-leg clash with Paris St-Germain in mind.

But he threw on Harry Kane and Michael Olise at the interval before Jamal Musiala also came on early in the second half and all three helped complete the remarkable turnaround.

Dominik Kohr scored a tidy volley in the 15th minute from a Kaishu Sano cross to put Mainz O5 into an early lead before Paul Nebel turned home a rebound from Nadiem Amiri's saved effort.

Sheraldo Becker tapped home in first-half stoppage time after Amiri had a strike tipped on to the bar by Bayern back-up keeper Jonas Urbig and it looked like the upset was on with Bayern heading for just their second league defeat of the season.

But on-loan striker Nicolas Jackson started the comeback when he turned home Konrad Laimer's cross seven minutes after the restart before ex-Crystal Palace winger Olise scored a stunning second after he cut inside off the left before curling the ball into the top corner in the 73rd-minute.

Olise was involved for the equaliser as he put the ball in for Musiala, who managed to bundle it over the line with 10 minutes remaining.

Kane completed the turnaround in the 83rd minute after Musiala's cross was pushed into his path by Mainz 05 keeper Daniel Batz.

Mainz 05, who were bottom of the Bundesliga after 13 games when head coach Urs Fischer was appointed in December, will have to wait another week to ensure they are mathematically safe from relegation as they remain eight points clear of the drop zone with three games to go.