"They are far and away the best team I've seen in Europe this year," he told the Irish Times.
"They beat us well in both matches, albeit the second time we had a B team out. But they were very, very impressive when they came to our place.
"I think Leinster have got everything to defuse the attack of Toulouse.
"I think they've got it all. They're well organised, they've got a good back three, they're good in the air and I know the guys they've got in their side work very hard without the ball - the likes of D'Arcy and O'Driscoll in the middle of the field."
Racing finished third in Pool 2 in their debut Heineken Cup season and currently lie second in the French Top 14 behind Toulouse.