Bayern Munich struggled in the match played under heavy snowfall and Bielefeld would have left the German football league's relegation zone with a win but had a fourth goal ruled out by a VAR decision.
Benjamin Pavard's close-range tap-in was enough to give European champions Bayern their sixth title within the last 12 months.
With no fans in the stands on a wet night in Bremen, it was a subdued and strange celebration for Bayern’s players, who put on commemorative T-shirts and paid tribute to their absent supporters with cheers.
Professional football resumed in Germany after a two-month break with four games in the second division taking place behind closed doors, and South Korea midfielder Lee Jae-sung scored the first goal in the division.
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