Egypt forward Zidan was introduced against his former team on 77 minutes, seconds before Hamburg's Anis Ben-Hatira was sent off.

Hamburg took the lead when Ruud van Nistelrooy opened the scoring on 39 minutes upon converting a penalty kick.

Jakub Blaszczykowski restored parity in the dying minutes after releasing a fierce drive from inside the area.

Leaders Dortmund are on top of the Bundesliga table with 66 points, while seven-placed Hamburg are on 42.