Geraint Thomas and Team Sky are primed and ready for an attack from Richie Porte on stage five of the Tour de France on Wednesday.
Thomas has been in the leader's yellow jersey for the opening days of the 2017 event after claiming first place in the prologue on Saturday, the Welshman producing a superb time-trial performance in Dusseldorf.
He holds a 12-second advantage over team-mate Chris Froome and Team Sunweb's Michael Matthews after stage three, with Peter Sagan a further second back.
Stage four is unlikely to make much of a change to the general classification given it is a relatively flat route, but Thomas knows Froome's GC rival Porte is likely to push hard 24 hours later.
"Tomorrow is the first big test," he told the Tour de France website ahead of stage four from Mondorf-les-Bains to Vettel.
"Whatever the team decides the plan will be I'll go with it. I'm fully committed to Froomey and winning the Tour with him and if I can be there or thereabouts, it would be a massive bonus.
"Tomorrow, Richie is going to try for sure. He is in great form and the climb is perfect for him.
"It's a one-off, short, steep blast. For sure he's going to try. It will depend what I've got to do."
The fifth stage of the 2017 Tour has the first big climb of the race up to the summit finish at La Planche des Belles Filles, where Froome won his first Tour stage in 2012.