IRELAND assistant coach Mike Catt insists there is plenty more to come from rookie fly-half Jack Crowley ahead of his maiden Six Nations appearance in Dublin.

Crowley celebrated his full debut in the championship by overcoming a few kicking errors to help his country register a thumping 38-17 round-one win away to France.

The 24-year-old is expected to retain the number 10 jersey for Sunday’s clash with Italy at Lansdowne Road as head coach Andy Farrell searches for Johnny Sexton’s long-term successor.

England World Cup winner Catt believes “nothing fazes” Crowley and was impressed by the Munster player’s response to a nervy start in Marseille.

“It’s something Andy has been driving over the past number of years,” Catt told the Irish Mirror.

“It’s ‘don’t get in the way of yourself, don’t worry about it. It’s gone’.

“For a man with inexperience, to block it out like that is very good. Nothing fazes him, like a lot of the boys in the team.

“We still haven’t seen the best out of Jack, there’s still a lot more to go, but it’s not a bad start.”

Crowley made his Six Nations debut with a three-minute cameo in a 34-20 victory in Rome last February.

Following 13 points at Stade Velodrome last Friday, he is likely to be given far more time to shine against Italy this weekend, with Farrell set to name his team this afternoon.