Williams has apologised to Valtteri Bottas after an unusual tyre mix-up resulted in the Finn being handed a drive through penalty during the Belgian Grand Prix.
Williams erroneously fitted one Prime tyre and three Option tyres to Bottas' car during his first stop, leading to a drive through penalty, which dropped him down the order.
"I am clearly disappointed with what has happened to Valtteri," said head of vehicle performance Rob Smedley.
"As a team we have made a mistake, and on behalf of the team I am very sorry that we cost him what could have been a podium position.
"There will be an investigation into the processes in place to understand what happened fully, and to put in place a procedure to stop this happening again."
Bottas nonetheless recovered from his set back to collect ninth position.
"We haven’t got the result we were after today," he said. "The pit stop and the race pace are two areas that we need to investigate.
"We thought we would be stronger during the race but the soft tyre in the first stint didn’t work as well and put us in a difficult position. We have to make sure we bounce back well in Monza."