Bundesliga club FC Cologne have on Wednesday been hit with a 595,000 euro ($641,800) fine for igniting pyrotechnics and throwing objects on the field which delayed a match.

Bayern Munich suffered a jolt to their title defence, losing their first league game of the season 5-1 in Frankfurt and handing Bayer Leverkusen the chance to open a six-point lead at the top of the Bundesliga.

Saturday's Bundesliga clash between Bayern Munich and Union Berlin has been postponed due to heavy snowfall in Munich, Bayern said in a statement.

Kane is also the first English player to score 18 times in one season in the Bundesliga.

Bayern Munich coach Thomas Tuchel on Thursday hit out at the crowded fixture list, saying it was "not for the good of the game and not for the good of the players".

Bayern Munich striker Harry Kane said Robert Lewandowski's league goals record was "still a bit too far away" despite again scoring a brace in a 4-2 win over Heidenheim on Saturday.

Bundesliga club Mainz sacked footballer Anwar El Ghazi on Friday, hours after German prosecutors opened an investigation over his social media posts on the Israel-Hamas war.

Bayern Munich striker Harry Kane joked that he would have to keep the match ball in his hotel room after scoring a Bundesliga hat-trick against Darmstadt on Saturday, as he is still yet to find a house in Munich.

Kane lobbed goalkeeper Marcel Schuhen from the centre circle to score Bayern's fifth and his second as Bayern tore Darmstadt apart on a rollercoaster afternoon for the champions.

A superb second-half chip from Julian Brandt sent Borussia Dortmund to the top of the Bundesliga table with a 1-0 home win over Werder Bremen on Friday.

Bayern Munich struck twice in the second half to come from two goals down and snatch a 2-2 draw at RB Leipzig on Saturday but the champions dropped to third place in the Bundesliga with their second draw of the season.

Borussia Dortmund will spend the night atop the Bundesliga table for the first time since the penultimate round of last season, winning 3-1 at Hoffenheim on Friday despite finishing with 10 men.

Bayern Munich coach Thomas Tuchel said on Thursday new striker Harry Kane was already on his way to becoming "an absolute success" story at the club.

Union Berlin have signed Italy captain Leonardo Bonucci from Juventus, the Bundesliga club announced on Friday.

European heavyweights will be on their toes to execute eleventh-hour acquisitions as the summer transfer window for Europe's top five leagues is set to close tonight, from 10pm to 4am (Bangladesh Standard Time).

Speaking after scoring twice on his home league debut in a 3-1 win over Bavarian derby rivals Augsburg, Kane said he was already building an on-field understanding with his colleagues.

Bundesliga club Bayer Leverkusen have signed forward Nathan Tella on a five-year deal from Championship side Southampton, both clubs said on Sunday.

Donyell Malen's second-half goal salvaged a point as Borussia Dortmund were held at local rivals Bochum 1-1 on Saturday.

Champions Bayern Munich are still a work in progress for coach Thomas Tuchel with their Bundesliga title defence starting on Friday against Werder Bremen.

Tottenham Hotspur striker Harry Kane has not yet completed his move to Bayern Munich but the German champions are working hard to finalise the deal, said Bayern coach Thomas Tuchel on Friday.