A severe infection has ruled Juergen Braehmer out of his World Boxing Super Series semi-final scheduled for this Saturday.
WBN were informed of the ailment on Monday evening, which was subsequently confirmed on Tuesday morning.
Opponent Callum Smith is now set to face a new opponent from the reserve undercard match between Nieky Holzken and Dmitrii Chudinov.
The WBSS are set to make an official announcement soon.
Smith was already a massive favorite to defeat the German in his home country this weekend and set up a final battle with George Groves in the summer.
Braehmer’s pullout comes as a double whammy for the WBSS organisers as Groves suffered a shoulder injury in his last four victory over Chris Eubank Jr. and is doubtful to be fit by the planned showpiece on June 2.
Kalle Sauerland is hopeful Groves will make it back to full fitness in time, although semi-final loser Eubank could be drafted in to take his spot in the Ali Trophy box-off.
It was confirmed Groves dislocated his shoulder in the final round at Manchester Arena on Saturday night and could face a four-month recovery.
That would mean any fight at the beginning of June would simply be an impossibility, whilst the WBSS are unable to delay the tournament climax beyond the month in question.
The draw for the next round of competitions is set to take place in July.