Saracens flank Kelly Brown is wary of the threat posed by former team-mate Kameli Ratuvou when they clash with Zebre in Parma on Saturday.
Brown classes the Fiji international as a "game-breaker" ahead of their Pool 3 European fixture.
"They have a very strong squad, with some very experienced forwards, two half-backs that can worry any side, and in Kameli they have a game breaking strike runner," Brown told Saracens.
"He's a handful. A lot of our guys have played alongside him here and know his capabilities, but they have quality throughout their side, and judging by some of the footage we've seen this week, they have threats throughout their team."
Brown added: "We have discussed Zebre, but we haven't obsessed over them - we will go into this game like we do any other, and that means trying to impose our game on the opposition.
"It's great to be back playing in Europe; going to places like at Parma can really test the character of a squad.
"In many a game I have been classed as the underdog, so I know how dangerous a team like Zebre can be - Italian sides are always a tough proposition so we are going there preparing for a huge test.
"Last time we played an Italian side in the Heineken Cup I dislocated my fibula so lets hope I come back in better state this time."