Lions sweat over fullback Coetzee
Coetzee sustained a hamstring strain during a warm-up at last week's Bok training camp in Stellenbosch.
The Lions had a bye in Round Seven after winning five of their six games in the tournament so far.
In their last match, the Lions beat the Sharks 34-29 in a thrilling match at Ellis Park in Round six.
Meanwhile, Springbok wing Ruan Combrinck could return to action towards the end of April. Combrinck has been out of action since injuring his shoulder in the Springboks' Test against Wales last November.
Flyhalf Jaco van der Walt will be out of action for four more weeks. Prop Dylan Smith is out for six months following his shoulder surgery in March.