OLEG TINKOV, the Russian multimillionaire owner of the Tinkoff-Saxo team, has challenged the four best riders in the world to contest all three Grand Tours in 2015 for €1m.

The eccentric Russian would like to see Alberto Contador, who rides for his Tinkoff-Saxo squad, Team Sky's Chris Froome, Astana's Vincenzo Nibali and Nairo Quintana of Movistar race in the Giro d'Italia, Tour de France and Vuelta a Espana in the same year.

The €1m purse could be divided equally, or be awarded as a prize to the rider who places best at the tours of Italy, France and Spain.

Many fans are already excited about the 2015 Tour de France, where the quartet are expected to meet to contest for the yellow jersey won by Nibali in 2014, and the route of the Giro d'Italia announced earlier this week suggested a Giro-Tour double might be possible. But few riders ride three Grand Tours in a calendar year, let alone contest for the overall victory.

Tinkov called for his gruelling idea to be adopted in an interview with Italian newspaper Gazzetta dello Sport and then took to Twitter to 'call out' Contador's rivals, including addressing Team Sky principal Sir Dave Brailsford.

Tinkov wrote: "dont be a chiken! £Real3GTchallenge"

Jonathan Vaughters, head of the Garmin-Sharp team, suggested Tinkov's plan was good for cycling. "In every successful sport, the best athletes compete against each other, all year, in the biggest events. So, yes, I agree," Vaughters said.

Meanwhile, Fernando Alonso's foray into cycling will not take place in 2015, but the UCI will welcome further discussions over a team backed by the former Formula One world champion.

The UCI yesterday announced the teams who have registered for racing licences for the forthcoming season, and an Alonso-backed team is not among them despite prolonged discussions over his entry into the sport. "The UCI has had very cordial and productive discussions with Fernando Alonso and his representatives concerning a possible team for 2015," a statement read.

"Whilst this has not led to a team for 2015, we thank Fernando Alonso for his interest and engagement and look forward to continuing discussions with him and/or his advisers."