Alonso's latest retirement came two weeks ago at the Mexico City Grand Prix.
Although the 41-year-old was classified as finishing 19th, he was forced to pull off the track after a cylinder problem that he had nursed for over 10 laps proved ultimately terminal.
But with spare power units in the pool already following earlier failures, Alonso does not expect to lose grid positions in Brazil.
“It should be ok because I have a new engine that I introduced in Austin and had the penalty there. It did only the Saturday and Sunday of Austin," he added.
“In Mexico, it was an old engine so I have a new engine for Brazil and Abu Dhabi, so it should be ok for two races.”