Wolves' hopes of a return to the Premiership this season all but disappeared after the 2-0 defeat at Home Park.
"I've got be honest, I am very disappointed and am extra disappointed because of the vital points that were available to us," the Wolves boss said after the game.
"That is as poor as we have played all season.
"We have spoken about it in there (the changing rooms) but there is more speaking to do on Monday because that was a poor performance all around."