"To be honest I expected him (Evans) to stay with us today. There was a lot of wind so it's just easy to sit on the wheels," said Riis.
"Everybody suffered a lot today, everybody made a lot of sacrifices and some will pay for that in their legs tomorrow. But hopefully not us."
Asked how Schleck or Sastre would deal with Evans on Wednesday, Riis was unequivocal.
"If you want to win the Tour you need to beat him, you need to drop him for sure because he's the fastest (of the contenders) in the time trial," added the Dane.
"I think the big battle will be on the Alpe d'Huez, but after the Galibier and the Croix de Fer if you're suffering on the Alpe d'Huez you can really lose a few minutes.
"If you go too deep today, you pay for it tomorrow."