Williams driver Felipe Massa labelled his pace a 'disaster' and was perplexed as to why he struggled throughout his home event in Brazil.
Massa was adrift of team-mate Valtteri Bottas all weekend and while the Finn was able to collect fifth spot, Massa trailed back in eighth position.
"My pace was a disaster the whole weekend, I don’t really… I don’t have any reason," he explained to assembled media.
"I was struggling during every session, first session, second session, third session, qualifying, the race was very difficult, I don’t know.
"Normally [this] is a track I know very well and am competitive here so I’ve no idea why I was struggling.
"We didn’t have a car for the podium but a few positions in front should have been possible."
Massa is being investigated after his right rear tyre was deemed to be 27c above the 110c limit on the grid, but the Brazilian says he felt no difference to usual.
"I have no idea, everything I felt at the start was no different to other races, I didn’t feel anything different, so it’s difficult to answer," he explained. "I’m sure the team will be better [placed] to understand."