Ireland fly-half Paddy Jackson may miss his country's tour of Argentina after aggravating a back injury during training.
The Ulster pivot, who has enjoyed a terrific season with the province both domestically and in Europe, was named by Joe Schmidt as one of two number tens heading to South America - the other being Jonny Sexton - for a pair of Tests against the Pumas.
But now the baby-faced fly-half's participation is in doubt, after a niggling back injury that plagued the 22-year-old for much of the season flared up during this week's two-day Ireland training camp.
Reports suggest Jackson, who hobbled to the sidelines during Saturday's PRO12 semi-final against Leinster, may be suffering from a stress fracture, with the IRFU confirming the concerns.
If Jackson is to miss out, Schmidt has no shortage of emerging fly-half talent. Leinster's Ian Madigan has impressed this season too, and is the favourite to be called up having been originally bound for a tour of Romania with Emerging Ireland.
Munster duo Ian Keatley and JJ Hanrahan are also at the Kiwi's disposal.