The former Dutch international saw his side drop three points after taking the lead in the 90th minute with a goal from young defender Stefano Denswil off a corner kick, only for Balotelli to convert from the spot after the referee had judged that Mike van der Hoorn had dragged Balotelli down.
“What Balotelli did was a judo move,” De Boer said after the match. “It was absolutely not a penalty, Balotelli also grabbed Mike and pulled him back with both hands.”
However, De Boer did not lay the draw entirely at the feet of the referee, stating that his side should have done better in the second half.
“The first half we were better, but not in the second half when we were too sloppy.
“It is a shame because there were spaces.”
Ajax are currently third in the group with one point from two matches.