The England internationals head into the tournament on the back of superb respective seasons for the Reds, with Sturridge scoring 21 goals in a campaign that took them to within three points of winning the Premier League.
"I think they will [make their mark], they've done brilliant," Saunders told Sky Sports News. "Sturridge has done better than everybody thought.
"The two English lads have done brilliant this season. Sterling has been magnificent this season, and Sturridge has done better than everybody thought."