The directors of ProTour cycling teams meeting in Paris this week are calling for the use of DNA evidence to identify doping cheats involved in the Operación Puerto scandal.

The directors want all cyclists implicated in the Spanish affair to agree to take DNA tests that would categorically prove whether or not their blood samples were held in the laboratory owned by Dr. Eufemiano Fuentes.

"All the teams will ask their riders to agree before January 1, 2007, to the UCI (International Cycling Union) using DNA testing if necessary, particularly in the Puerto affair," a spokesperson for the teams' association(AIGCP) told AFP.

Cyclists implicated in the Puerto scandal would have to do so before being allowed to sign a new contract.

That could have implications for Germany's Jan Ullrich and Italian Ivan Basso, both suspended from the Tour de France in July for their alleged implication in the Spanish doping ring.

Until now, both have refused to take DNA tests, but neither has a contract as of yet and may be forced to submit a sample prior to signing on for a new team.

The ProTour teams had already implemented a number of measures in a meeting at the world championships in Salzburg last month.

Here, UCI president Pat McQuaid and new UCI anti-doping manager Anne Gripper called for cooperation among those involved in cycling in the battle against doping.

That included a call for tougher internal sanctions, financial support from teams and riders in the out of competition fight against doping and support for DNA testing.