The Vuelta al Pais Vasco starts tomorrow. The Radioshack-Leopard team has named its line-up for the race. But one rider is missing from the original schedule. Chris Horner will miss the race due to a knee problem.

The 41-year-old American withdrew from the Volta a Catalunya two weeks ago. His team says in a pres release that the rider was suffering with suffering with an iliotibial band friction syndrome.

The American traveled to Basel in Switzerland last week for treatment. Now he is back at home in Bend, Oregon. He is expected to be back in training next week and maybe he will be back in form for the Amgen Tour of California in May.

In his absence, Andreas Klöden, Maxime Monfort and Haimar Zubeldia will be the leaders of the RadioShack-Leopard team.

Andy Schleck will also race, just as Matthew Busche, Laurent Didier, Ben Hermans and Jens Voigt.