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Manchester City and England striker Toni Duggan has apologised for an "error of judgement" after posing for a photograph with Louis van Gaal.

Duggan deleted the photo with Manchester United's manager

"I appreciate the significance of my actions and assure everyone connected with City that I am proud to represent the club,"

Duggan joined from Everton in 2013.

The 23-year-old was pictured with Van Gaal when out celebrating with team-mates after scoring in City's 3-1 win over Birmingham City Ladies in the FA Women's Cup quarter-finals on Sunday.

City's men's team were beaten 4-2 by United in their Premier League derby the same day.

Duggan has made 16 appearances for England, scoring 11 goals.

In March 2014, she apologised for painting her face black and dressing as film star Whoopi Goldberg's character in Sister Act for a fancy dress party.

said Duggan would keep her role as an ambassador with the anti-racism campaign group despite the incident.