Arthur Abraham has until 3.40pm to make the weight after shockingly weighing over by 1lb and 13oz.
The former two-weight world champion came in at 12 st 1lb and 5oz.
Bemused, Abraham demanded the scales to be moved to the floor as he looked on in disbelief.
IBO champion Chris Eubank Jr weighed within the limit at 11st 13lbs and 3oz.
If unable to make weight, the contest will be a non-title fight.
More to follow from the SSE Arena.
Joe Hewlett is lead writer for World Boxing News. Follow Joe on Twitter @Hewlett95