Lorenzo is scheduled climb on his 2017 bike for the first time on the two days of testing after the season finale in Valencia.

After these two sessions, the Majorcan will not return to the track with the Desmosedici until the first pre-season test next year, scheduled for 30 January to 1 February.

Ducati has the Jerez circuit booked for 23-24 November and asked Yamaha to free up Lorenzo, who in theory is still under contract with the Japanese squad until 31 December.

However, as Tardozzi told Italian newspaper Gazzetta dello Sport, the answer was negative.

"We tried to unlock the situation in every way possible, but we found ourselves facing a wall," admitted Tardozzi, who pointed out that Ducati has allowed Andrea Iannone to test for Suzuki.

"We didn't even think about it [not letting Iannone test]. We believe that in a environment of sportsmanship these things should be common."

Conversely, Lorenzo's Yamaha replacement Maverick Vinales will be able to run at Sepang, where the Japanese squad will carry out two days of testing, also on 23-24 November, with the new M1 for 2017.