"I very much regret the result," Fuchs said by telephone.
"Tsipras has caused a disaster and must see how to pick up the pieces. There is no chance that a solution will be achieved within 48 hours," said Fuchs, who has long had reservations about bailouts for Greece.
A more moderate German conservative, Julia Kloeckner, said in a statement that Tsipras should not think he could put Germany and Europe under pressure with the referendum result but stopped short of calling for a Greek exit from the euro zone.
(Reporting by Andreas Rinke; Writing by Madeline Chambers; Editing by Noah Barkin)