Defeat in the Nordderby at Bremen's Weserstadion would push Hamburg closer to their first-ever relegation from the Bundesliga.
2017 SeasonAll times ET
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.
Promoted Hannover defeated injury-hit Hamburg 2-0 at home in the "little northern derby" to maintain their fine start to the Bundesliga on Friday.
Naby Keita opened the scoring as Hamburg's 100 percent winning start to the Bundesliga season ended following a 2-0 defeat at home to RB Leipzig.
The 27-year-old has not hit the back of the net in 183 league games since his debut for Nuremberg against Schalke in August 2009.
Ten-man Hamburg maintained their 100 percent record and netted the latest goal to be scored in the Bundesliga since Opta's records began in 2004.
On Saturday, Muller fell to the ground during his "helicopter celebration" after scoring the eighth-minute winner against Augsburg.
Hamburg investor Klaus-Michael Kuhne has said he was only willing to provide funds for the transfer of Andre Hahn if the club kept Bobby Wood.