Carlos Sainz says he is becoming 'desperate' to finish races after he suffered his fourth mechanically-induced retirement in a row during the Belgian Grand Prix.

The Spaniard's Toro Rosso developed an issue on the formation lap, forcing him to pit from what would have been tenth on the grid. Though the team quickly solved the issue and he was able to rejoin, Sainz was left two laps down.

Eventually withdrawing in an effort to save the engine, Sainz admits he is becoming frustrated with the ongoing reliability problems having now been forced to retire from top ten positions in each of the last four races.

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"I started the formation lap and I had no power from the engine, so I had to box. They managed to resolve it and I got out, but I was already two laps down. I did a bit of the race and then we decided to retire to save the mileage of the engine.

"I am very disappointed, very desperate to finish a race now because it is four consecutive races where we have been in the points and we don't finish. You can imagine my frustration, but this is how it is sometimes. It doesn't mean I am going to back off, I am going to keep pushing and showing my performances. Hopefully this is enough to keep going forward and learning."

Indeed, with team-mate Max Verstappen going on to finish eighth from 18th on the grid, Sainz feels a strong result was in the offing for him, but he is taking heart from the fact he isn't the reason for the exits.

"With everyone who retired and the pace we showed, it would have been a very good day for the team. It is a big frustration as we have had four consecutive races in the points, but four consecutive races in retirement. You need to stay positive, you know these retirements are not coming from me."