"Of course what happened last Saturday evening in Ireland affected the whole team, but especially in this way Artur Boruc," Beenhakker told reporters ahead of Wednesday's home clash with San Marino.
Besides letting in two Northern Ireland goals - the first of which Beenhakker called a "present" to the hosts - Celtic's Boruc mis-kicked a back pass from a team-mate, allowing the hosts to stretch their lead to 3-1. Beenhakker said the third goal "killed" Poland.
The visitors had pulled a goal back in stoppage time but it was too late to deny Northern Ireland the 3-2 win, keeping their campaign to reach the 2010 FIFA World Cup finals in South Africa firmly on track. Dutchman Beenhakker said he had had words with Boruc after the game.
"In this conversation I informed him, openly and honestly, that I will not use him for the match on Wednesday versus San Marino," he said. "You can imagine that Artur was very affected of course about what happened Saturday, especially his role during the match, and we both decided that the best decision was that he should leave the camp and go back to Glasgow."
Boruc was the target of persistent verbal abuse from Northern Ireland fans. However, after Saturday's match Beenhakker had insisted that the taunts had not led to Boruc's errors, saying the keeper was very experienced and that the overall problem was the poor quality of his side's performance.
Poland next play minnows San Marino on Wednesday in the southern town of Kielce, with Beenhakker to choose between Arsenal's Lukasz Fabianski and Dundee United's Lukasz Zaluska for the goalkeeping slot.