Ivan Basso has left the Tour de France after being diagnosed with testicular cancer and will undergo surgery tomorrow to have a tumour removed from his left testicle.

The Tinkoff-Saxo rider, twice Giro d'Italia winner, told the Gazzetta dello Sport: "This evening I am in Milan and tomorrow they will operate on me immediately.

"We became aware of it after my fall in Stage 5 [in Amiens]. That day, I fell and bashed my testicle against the saddle, like so many other times.

"However, it started to irritate me so this morning we visited a well-known urologist here in Pau. The CAT scan showed the presence of tumourous cells in my left testicle.

"At this point, I have to go home straight away to be operated on," added Basso, who has been rooming with team leader Alberto Contador during the race, which he is riding for the last time.

Basso, aged 37, joined Tinkoff-Saxo on a two-year deal at the start of this year. As yet there is no indication of when, if at all, he envisages riding again.