That is according to former team boss Flavio Briatore, who believes the two-time champion could return to F1.
Lewis Hamilton fought off Ferrari’s Sebastian Vettel this season to seal his fifth World Drivers’ Championship title.
The Mercedes man won a total of 11 Grands Prix in 2018 – a stark contrast to Alonso’s fortunes.
Alonso ended the year 11th in the standings having failed to secure a single podium finish.
And he called time on his F1 career last month having endured a disappointing four-year spell with McLaren.
Fernando Alonso is now targeting Indianapolis 500 glory as he seeks to become only the second driver to claim motor sport’s Triple Crown.
Briatore, regarded as the man who discovered Alonso, has now revealed he believes the 37-year-old could one day make an F1 comeback.
And while he admitted it would take a top team to tempt Alonso, he reckons the Spaniard could cause problems for Hamilton.
“If there is an offer from Mercedes or Ferrari, would [Alonso] come back? I think so,” Briatore said.
“I cannot know, but in a fantasy market, I think so.
“There are only two teams. The only other solutions are to finish fourth, fifth or sixth.
“I think with the talent he has, you put him in the right car and he could still be the strongest driver along with Hamilton.
“We will see what happens in a few months or a year.
“He wants a rest, and I think after so many years many like [Alain] Prost did it as well. Now he needs a period of relaxation.
“He had frustrating years with a ridiculous performance by McLaren but Fernando always behaved impeccably and drove beyond the highest level.”
Hamilton, meanwhile, will start his F1 title defence at the Australian Grand Prix in Melbourne next March.