Reigning F1 champion Jenson Button has expressed his concerns about the entry to the pit lane at the Yeongam circuit hosting this weekend’s inaugural Korean Grand Prix.

The 30-year-old Briton, who sits in fifth place in the championship for McLaren with three races remaining, says the entry to the pit lane at the 5.621-kilometre circuit is “scary”.

The pit lane entry is situated on the outside of the anti-clockwise track, with cars braking in the middle of Turn 18, a blind right-hand corner in a narrow section of the circuit.

“The only worry I have is the pit entry, which is a bit dangerous. It’s a little bit scary,” Button said.

“It’s a corner when you’re on full speed – 250km/h on the exit – and if someone goes in the pits, they have to lift (off the throttle) quite heavily. That’s a bit of a worry, and I don’t really know how we’re going to get around that issue.”

Sebastian Vettel, of Red Bull, said the pit lane entry was “difficult”.

“The pit entry is quite on the edge because it is blind,” he said.

“You cannot see if someone goes in (to the pits), and they have to go slower than someone who stays out. If you are behind someone trying to pass and he chooses to pit, it could be difficult.”