Leading Le Mans duo Porsche and Toyota have both ruled out the possibility of Fernando Alonso joining their 2018 line-up.
Alonso has set his sights on claiming the Triple Crown and his preparations for the upcoming Indianpolis 500 at the end of the month are well underway.
However, he could be in for long wait to join a competitive team for the third and final jewel in the Triple Crown after the two strongest teams poured cold water on the swirling rumours.
"At the moment it’s not on the table on our side because we only have two cars and I do not see that changing for next year," Porsche boss Andreas Seidl told Motorsport.com.
"With the six drivers we have right now, we are very happy. We have no seats available.
"It would have been easier in 2015 with the third car. We had talks there, it didn’t work out in the end. At the moment there are no options available on our side."
Toyota have a three-car entry in the World Endurance Championship, but Rob Leupen is still not particularly keen on having a "big name" like Alonso.
"From my point of view, it has to be balanced within the team," Leupen said.
"It’s not a priority to get a big name in. There is no focus on this at all.
"Of course you would listen [if he approached Toyota], but for us it’s not something we would say we are interested in. Not at all."