Errors from the Dutch defender saw the visitors take the three points against Stoke on Saturday, and he apologised for his mistake
Erik Pieters shouldered the blame for Stoke City's 2-1 defeat at home to Chelsea, a result Mark Hughes believes guarantees the Blues the Premier League title.
A wayward pass from Pieters gifted Chelsea a free-kick in the closing stages, and when he failed to clear David Luiz's header from the resulting set-piece, Gary Cahill struck an 87th-minute winner.
The Dutchman owned up to his errors and was disappointed it cost Stoke a point he felt they deserved.