Hamburg defender Kyriakos Papadopoulos faces disciplinary action after criticising interim coach Christian Titz after he was dropped.
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Hamburg have sacked head coach Bernd Hollerbach less than two months after his appointment.
Bayern Munich have not tasted defeat since Nov. 25 and have now won 16 of their last 17 matches in that run.
Hamburg have removed CEO Heribert Bruchhagen and sporting director Jens Todt as they head towards their first ever relegation from Bundesliga.
Hamburg are holding a short training camp ahead of their Bundesliga match against Mainz in order to help avoid being relegated for the first time.
Defeat in the Nordderby at Bremen's Weserstadion would push Hamburg closer to their first-ever relegation from the Bundesliga.
Hoffmann took the seat from Jens Maier by 585 votes to 560 votes and made it clear that changes could be made to the struggling club's hierarchy.
Michy Batshuayi scored again as Borussia Dortmund moved third in the Bundesliga with a 2-0 win at home over Hamburger SV on Saturday.
Hamburg have appointed Bernd Hollerbach as their new coach on a deal until June 2019.
Hamburg have sacked Markus Gisdol as coach following the side's 2-0 defeat at home to last-placed Cologne in the Bundesliga.
United States international Bobby Wood will miss Hamburg's Bundesliga match against Eintracht Frankfurt on Tuesday night, the German club said.
Freiburg and Hamburg battled out an uninspiring goalless draw on Friday night which did little to boost either side's position in the Bundesliga.
Hamburg have been granted special dispensation from the authorities to play 17-year-old striker Jann-Fiete Arp in the Bundesliga on Friday.
Jann-Fiete Arp, the first born in 2000 to score a Bundesliga goal, rejected Chelsea to develop with Hamburg and has been likened to Harry Kane.
Hamburg boss Markus Gisdol says U.S. attacker Bobby Wood is in a "negative spiral" and warned: "The performance principle also applies to him."
Hamburg coach Markus Gisdol has backed Bobby Wood to find the back of the net again, and praised the U.S. international's attitude in training.
Corentin Tolisso struck early in the second half as Bayern Munich made it three straight wins under Jupp Heynckes, 1-0 over 10-man Hamburg.
Borussia Dortmund leapfrogged Bayern Munich back into top spot in the Bundesliga following a 3-0 win at Hamburg on Wednesday.
United States forward Bobby Wood could return from a knee injury for Hamburg as soon as Wednesday's match against Borussia Dortmund.
United States forward Bobby Wood missed Hamburg's Bundesliga defeat at promoted Hannover on Friday because of a reported knee injury.