The 33-year-old leads the all-time try scorer list in Europe’s premier club competition with 40 tries and will line up for Quins looking to add more to his tally.

In the English side’s way are a Munster outfit who Ashton has faced in the competition several times in his career to date.

“One of my first memories, funnily enough, would be [playing] against Munster,” said Ashton.

“Having come from Rugby League, [where you were] always playing against your local team, to be able to leave Northampton and go across to Thomond Park, and just experiencing Thomond Park when Munster were at the top of their game and with a full crowd, it was something I’d never experienced before.”

Two-time European Cup winners Munster have enjoyed an electric start to their domestic season, winning seven from seven in the Guinness PRO14 and Ashton is aware of just how tough a task it will be to get a result at Thomond Park.

"Munster have started really well in the league, and Thomond Park, whether full or empty, is always going to be a very difficult place to go and get a win,” he added.

“I remember Quins did it a few years ago, they went and got the win, which was unusual, but there are some players here that have been there and done it.

“I’ve, unfortunately, not been able to go and do it. It is a hard place to go and get a win, and, like I’ve said, the Champions Cup means an awful lot to Munster.

“So, we’ll be expecting both barrels come that game.”

Watch Munster Rugby v Harlequins live on BT Sport, beIN SPORTS and Sky Italia from 17:30 (UK and Irish time) on Sunday.

Two-time Heineken Champions Cup winner expects Munster Rugby to give his Harlequins side “both barrels” during their opening round meeting on Sunday evening.