Saracens will arrive in Limerick as Pool One leaders, three points clear of Munster, and they are bolstered by returning England quartet Alex Goode, Chris Ashton, Owen Farrell and Brad Barritt, who were all stars of last Saturday's stunning Twickenham victory over world champions New Zealand.
"You can look at the footage on Saracens and prepare yourself, but it comes down to how we play and we just need to look after that side of things," said Downey. "They have a strong back-three, and they are pretty strong all over, really, to be fair to them."
He added: "They've a good pack and they are well-drilled and know what they are doing. I've played against them many times.
"I suppose with a couple of new signings they have expanded their game a little bit. They are a quality side, and they have some internationals coming back this week with a good buzz after beating the All Blacks, so we will have to watch them carefully."