Slot was due to receive the annual Manager of the Year award from the group after leading Liverpool to last season's Premier League title.
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But the Dutchman ducked the evening with his team now flailing this term.
Defeat at home to Nottnigham Forest was the sixth in the league for Liverpool and has left them sitting 11th on the table.
In Slot's place, Liverpool sent club ambassador Gary McAllister to collect the award on his behalf.