Alberto Contador believes he will need to claim more valuable seconds off Bradley Wiggins in the Alps if he is to hold off the Briton's yellow-jersey challenge in the Tour de France's final few days.
Contador captured the maillot jaune on Sunday with an attack up to Verbier that helped him win the 15th stage.
Wiggins is currently third in the general classification, one minute and 46 seconds behind the Spaniard, and is providing a concerted challenge in the mountains.
With an individual time trial, something Wiggins specialises in, still to come, Contador knows he cannot relax with the Londoner around.
"I notice Bradley Wiggins did sensationally in the climb up to Verbier and he is going to have to be taken into consideration," Contador, who finished 66 seconds ahead of the Briton in Sunday's stage, told L'Equipe.
"I will have to try to put as much distance as possible from him during the next mountain stages, because he is a really strong contender when it comes to the time-trials."
There are two more stages in the Alps before Thursday's individual time trial in Annecy.Reuse content