Michael Stewart won - and scored - a penalty against St Mirren

Midfielder Stewart tumbled under pressure from van Zanten for Hearts' second goal of a 3-1 victory.

"It wasn't a penalty, probably not even shoulder to shoulder," said van Zanten, whose side had already had two penalty claims of their own rejected.

"He just threw himself down to the ground and conned the ref."

Stewart accepted the decision by referee John Underhill, scored from the spot and defended himself against accusations of diving.

I felt there was contact Michael Stewart

"I was running into the box trying to get across him," said the Hearts midfielder.

"I felt there was contact. If you get across him, it makes it extremely difficult for him.

"I wasn't deliberately trying to fall down, although sometimes your legs can get tangled without meaning it."