Villas-Boas joined Chelsea from Porto in June last year after capturing a treble of Liga Sagres, Portuguese Cup and Europa League during his first full season in management.

But the inexperienced 34-year-old has struggled to replicate that success at Stamford Bridge, and told Portuguese radio station TSF he could suffer the same fate as sacked predecessor Carlo Ancelotti.

"It'll be one of two (reactions) - a continuation of the project and full support or just the cultural pattern that has happened before (dismissal)," he said.

"We don't know if it'll be tomorrow or in two years from now."

Chelsea have struggled for consistency this season and trail Premier League leaders Manchester City by 17 points.

The west London club are also facing elimination from the UEFA Champions League after losing 3-1 in the first leg of their last 16 tie with Napoli.

Villas-Boas' acknowledgement of his precarious situation comes just days after veteran midfielder Frank Lampard said his relationship with the new coach had 'not been ideal'.

There have also been widespread reports of Villas-Boas falling out with influential senior members of the Chelsea squad.