The Prince of Monaco, Albert II, has said the Champions League quarterfinal first leg at Borussia Dortmund should be postponed to a later date following the attack on the German side's team bus.
The Office of the Attorney General of Germany is investigating after three explosions rocked the Borussia Dortmund team bus as it drove to their home stadium for Tuesday's Champions League match, injuring defender Marc Bartra and causing the game to be postponed.
After consultation between the clubs, UEFA and the German authorities, it was decided to play the match on Wednesday evening, but Albert II told RTL the severity of the incident had merited further delay.
"We had news of the Dortmund players little by little and we knew there was an injured player, that the other players were safe, and that our players were safe," he said.
"Sport mustn't be taken hostage by madmen, because there are no words to describe these unbalanced people while we wait to learn of their motives.
"It's beyond football, it's disgusting and horrible. It's perhaps not the best solution to play the day after an incident of such a scale."
In a statement, Dortmund CEO Hans-Joachim Watzke urged the club's players to demonstrate that "terror and hate will never dictate our actions" when they play the rearranged match.
He said: "We don't play only for ourselves today. We play for everyone, no matter your club -- Borussia, Bayern or Schalke.
"We want to show that terror and hate will never dictate our actions. And we of course also play for Marc Bartra, who wants to see his team win."
Watzke: "Ich habe gerade in der Kabine an die Mannschaft appelliert, der Gesellschaft zu zeigen, dass wir vor dem Terror nicht einknicken."
- Borussia Dortmund (@BVB) 12 April 2017
Watzke urged the Dortmund fans "to support us with full energy for 90 minutes."
And he said: "This team had to come to terms with unbelievable things in a short period of time. We should all help them to surpass themselves."
In a statement on their official website, Monaco expressed "all our support" for Dortmund, while captain Radamel Falcao wished Bartra, who was taken to hospital with a broken wrist, "a speedy recovery" on Twitter.
Monaco's communications director Bruno Skropeta told L'Equipe the players may struggle for focus in the rearranged match.
"It's a very difficult situation because football should not go through this type of event," Skropeta said. "It's not going to be easy, of course, but football has to continue."
Former France international William Gallas joined those expressing their shock and sadness at the incident.
"I think it'll be a bit difficult for the Dortmund players to go out onto the pitch with their spirits free knowing that one of their teammates was injured in this incident," he told SFR Sport.
"It's always sad to hear something like that. I hope the Dortmund players will have the strength to play this game."
Ligue 1 leaders Monaco have had a request for the kickoff of their Saturday game against Dijon to be delayed until 21:00 CEST granted.