Bayern Munich's record signing Harry Kane scored once and set up another goal on his Bundesliga debut to steer the champions to a 4-0 victory at Werder Bremen on Friday and a winning start to their league season.

England captain Kane, who joined for a league record 100 million ($108.68m) last week to solve Bayern's scoring problems, slotted their second goal in the 74th minute after setting up Leroy Sane for a fourth-minute opener.

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Sane added another in the 90th minute with an easy tap-in, and Mathys Tel made it 4-0 in stoppage time.

"It's been a great buildup towards the game," Kane told ESPN. "Obviously been here now for about a week, so been really excited to get going, get out there and get playing.

"I couldn't have asked for a better start, to get on the scoresheet, to help the team with an assist early on and to win the game, it's just a perfect start and hopefully we can continue it."

Kane also confirmed that an apparent injury that led to his substitution late on was "just a bit of cramp."

Bayern suffered a surprise 3-0 home loss to RB Leipzig in the German Super Cup last week, with Kane making a second-half substitute appearance following his move from Tottenham Hotspur.

But they quickly went in front when Kane sent Sane clear to beat goalkeeper Jiri Pavlenka.

Despite having boxed Werder completely into their own half for much of the first 45 minutes, Bayern could not add another with Kane marked well and the visitors trying their luck mainly with long-range efforts.

Werder attempted to catch Bayern off guard straight after the restart and carved out three consecutive chances in the first four minutes of the second half.

The visitors, however, heeded the wake-up call and quickly recovered, responding with Kingsley Coman curling a shot onto the post in the 59th and Kane forcing a good save from Pavlenka two minutes later.

Bayern, who won their 11th straight league crown last season after Borussia Dortmund slipped up on the final matchday, sealed the three points when Kane drilled in their second goal.

With Werder having run out of steam, Sane scored his second of the evening after combining with Thomas Müller in the box, and substitute Tel fired in their fourth to wrap up the win.