Lorenzo won three premier-class titles for Yamaha before leaving the manufacturer to join Ducati at the end of 2016.
His replacement Maverick Vinales started impressively, winning the opening two races of 2017, but his and Yamaha's form has tailed off dramatically since.
The most recent race at Aragon cemented the manufacturer's current winless streak as its worst ever in MotoGP.
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Jorge Lorenzo, Marc Márquez (GP Aragón)

Image credit: Getty Images

But Lorenzo has backed his former employer to recover from the slump, likening it to the droughts occasionally suffered by Spanish football giants Barcelona and Real Madrid.
"I think MotoGP is a little bit like soccer in the way that it's like a cyclical thing," he said.
Barcelona, Real Madrid can have three or four difficult years, and sooner or later they come back.
"Yamaha have the history to come back, and I think sooner or later they will."
Yamaha rider Valentino Rossi said at Aragon that the last time Yamaha made a significant improvement to the YZR-M1 bike was during 2015 - a season the manufacturer dominated, with Lorenzo snatching the riders' title from Rossi.
Asked whether he saw signs of Yamaha's upcoming decline the year after (pictured above), in which Lorenzo and Rossi were beaten by Honda's Marc Marquez, Lorenzo said: "2016 was a difficult year, because we started strong with the electronics, then Honda improved a little bit and they caught us.
"We were a bit inconsistent in the races, but we were very strong in some tracks. I got four victories, but we were stronger in 2015 obviously.

Jorge Lorenzo, Marc Márquez (GP Aragón)

Image credit: Getty Images

"But as I said before, it's a cyclical thing and they [Yamaha] will come back sooner or later."
Yamaha's current riders do not expect a turnaround in the team's fortunes this year, with Rossi admitting it would need a "miracle" to win a race and Vinales saying he had "zero motivation, zero expectations" for the rest of 2018.
Rossi has also already expressed concerns over the 2019 bike, while Vinales insisted he did not dare to look that far ahead.
"I don't want to think about next year. Otherwise I will be bad, I will make 15th [place]," said Vinales.
"I need to concentrate on this year. I do my best to trust the bike, trust we can do another step.
"And I need to be ready that when the bike works better, I can be better. That's it. I don't want to think about next year already."
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