Leicester Tigers scrum-half Sam Harrison suffered what was described by the club's doctors as "a nasty" broken nose in the win over Worcester.
Harrison came off shedding plenty of blood after a head clash with Worcester's Andy Symons at the start of the second half.
The number nine subsequently went to hospital for tests, while Symons returned to the field.
"It was a nasty clash and there was lots of blood coming from his nose and mouth. Looking at the indent I'd say it's broken," Leicester head coach Aaron Mauger said.
"He is going to hospital to get assessed so we will see how he is over the next few days. The medics told us it was a nasty one.
"He's a tough man, Sammy, and I'm sure if you gave him the opportunity he'd be back on the field tomorrow."
Crucially the result for Leicester at Welford Road secured their berth in the semi-finals, making it 12 straight seasons that the Tigers have been in the Premiership play-offs.
Despite that feat Mauger wasn't swayed entirely by Leicester's performance, even though the Tigers scored four tries through Vereniki Goneva, Opeti Fonua, Telusa Veainu and Will Evans as Owen Williams kicked 15 points.
"I'm pleased to get to the semis, it's a nice feeling. But the performance was a bit flat," he added.
"It was probably a reflection of the last four weeks, four big, emotional games – Gloucester, the European quarter-final against Stade Français, the derby against Northampton, and Racing.
"We could see during the week that the boys were mentally and emotionally flat and that transferred into the performance."