Wolfsburg have apologised after a flare thrown by their fans hit the Hannover bench before Tuesday's Bundesliga match.
Bild reported that a team doctor, physio and reserve goalkeeper were on the bench but escaped injury.
Kick-off was briefly delayed before visitors Wolfsburg won 4-0 with Andre Schurrle scoring a hat-trick
"We condemn the scenes before kick-off," said Wolfsburg sports director Klaus Allofs.
"I apologise to the Hanoverians that they have been put at risk."