Lewis Hamilton claims Ferrari and Red Bull are "in another league" to Mercedes after the seven-time Formula One world champion qualified in fifth for Sunday's Bahrain Grand Prix.

Hamilton, who missed out on a record-breaking eighth drivers' championship title last year in controversial circumstances after an absorbing battle with Max Verstappen, has previously cast doubt upon Mercedes' ability to compete in 2022.

The 37-year-old insisted that his team would not be competing for early wins at the end of pre-season testing, and impressive performances from Ferrari and Red Bull has done nothing to change Hamilton's opinion.

Ferrari pair Charles Leclerc and Carlos Sainz will begin Sunday's season-opener in Bahrain on the front row, either side of defending champion Max Verstappen.

With Verstappen's team-mate Sergio Perez fourth-fastest, Hamilton claimed that he did not expect to compete with either Ferrari or Red Bull in Bahrain, saying the two teams are "in another league".

"I'm not saying I'm relieved [with fifth place]," Hamilton told Sky Sports. "[But] I'm generally really happy with the day, given where we've been the last few weeks, [with] the struggles that we've had, the problems that we've had with the car.

"It has been a bit of a nightmare to drive, but we've kept our heads down, kept working away and I'm proud of everyone for staying positive.

"The guys ahead of us are in another league. 

"I'm generally happy where we are, it's not the front row, but we will make improvements and we'll do the best we can tomorrow."

Hamilton, who won last year's Bahrain Grand Prix after starting second on the grid, said his task for Sunday would be to ward off pressure from those behind him, including his former Mercedes team-mate Valtteri Bottas, who will start his first race for Alfa Romeo in sixth.

"These guys [the Red Bull and Ferrari drivers] will be going ahead," Hamilton added.

"We are not in the fight with them, they were a second ahead of us yesterday. My battle is with the guys behind us.

"Of course, I'll try to be as fast as I can and get ahead, but their performance was quite a bit ahead of us."

Mercedes are looking to win a ninth consecutive constructors title this term, with Red Bull last winning the title back in 2013.