Saracens know they will have to hit the ground running after being named in a difficult group in the Champions Cup.
The English champions were drawn alongside 1999 champions Ulster, four-time winners Toulouse and newcomers Oyonnax in Pool 1.
Director of rugby Mark McCall coached Ulster before working with Saracens, and the two sides know each other well, having faced off in the knockout stages of the competition in recent seasons.
Sarries will also meet Toulouse again, two years after the sides were drawn together in the pool stages. However the French giants will have a different look on this occasion after Guy Novès stepped down to take over as France coach.
"It's going to be an interesting competition this season with the World Cup, but it's a very exciting draw," said McCall.
"I've been back to Ulster twice in the knock-out stages and we've won both games and I know it is going to be an incredible atmosphere at the Kingspan Stadium with the developments they've made there.
"Toulouse have a very settled side, but will have a new coaching team. It will be interesting to see how they go without Guy Noves at the helm. We have learned you have to fight for every point in this competition, so we'll have to roll up our sleeves."