Last season’s finalists followed up their stunning 42-10 win at Racing 92 with a crushing 57-0 success over Gloucester Rugby in Dublin last Friday, but Cullen knows it won’t always be so easy.

“I thought there were lots of things to like about both performances, dealing with different challenges,” he said. “But we think there are going to be tougher challenges ahead.

“Credit to Gloucester, I thought they fired in and made life difficult for us. We got a couple of decisions and I thought we were generally reasonably good and composed in taking the opportunities when they came along.

“Obviously, a couple of scores just before half-time gave that bit of separation – it went from 17-0 to 31-0 – which puts a totally different complexion on the game.

“From our point of view, there was plenty of good stuff in the game and plenty of things we can improve upon as well.”

Leinster head to Kingsholm Stadium in Round 3 on January 14, when Cullen believes Gloucester will be much tougher adversaries, especially with several key players set to return for the Gallagher Premiership outfit.

“Gloucester, when they play at Kingsholm in front of the Shed, are a very, very proud club there, so I’m sure they’ll come out firing,” he stated.

“They have other players who I’m sure they’ll bring back into the picture as well, so it’s important that we’re not getting carried away with ourselves as well.

“But it’s nice to have 10 points on the board and looking forward to the challenge that’s ahead.”

Leinster’s convincing victories see them top Pool A after two rounds and Cullen is eager to continue racking up points given that home advantage in the knockout stage is on offer to the leading sides - something the Irish province missed out on in last season’s quarter-finals.

“We’ll see where everything sits, but it is great to be in a healthy position in our pool and whether you need two more wins or whatever,” he said.

“Now you are in a position where you can be top. We weren’t in that position last year and you are looking at all the different permutations.

“They are all much simpler for us now. Ideally, score four tries [in each game] because we have a decent bank of points at the moment.”

Leinster Rugby head coach Leo Cullen insists his side are “not getting carried away” after picking bonus-point wins in their opening two Heineken Champions Cup games.