Munster have added Neil Cronin to their Champions Cup squad as they battle a crisis at scrum-half.

Cronin has been recovering from a shoulder injury but head coach Johann van Graan had initially suggested he would not be back in time for Saturday's opening game of the tournament away to Exeter.

However, he has now been brought into the 41-man squad in place of out-half Bill Johnston. 

The 25-year-old returned to Munster for a second spell at the start of this season after starring for Garryowen in the All-Ireland League.

Ireland No 9 Conor Murray remains out for an unspecified period with a neck injury while former All Black Alby Mathewson, brought in as short-term cover for Murray, suffered a knee injury in the defeat to Leinster last weekend. Both remain in the squad.

James Hart is also on the injury list, meaning only Duncan Williams and academy player Jack Stafford would be available if Cronin does not win his fitness battle.

Clubs can make three, reversible squad changes over the course of the tournament, one of which must be a front-rower.

Connacht have brought in out-half/centre David Horowitz to their Challenge Cup squad in place of the injured Craig Ronaldson.

The Westerners host Bordeaux at The Sportsground on Saturday.