Dave Woods said: “It was a poor performance. It wasn’t a professional display at all.
“London played really well; they worked hard and deserved the draw. But we weren’t at the races. It wasn’t acceptable.”
He added: “We’ve drawn a line under it, and we’re throwing it out. We need a good display just to repay the fans.”
Demetriou said: “I need players to have game-time. I can’t afford to go into the Co-operative Championship One season with five or six players who haven’t had any game-time, so I’ll be changing things around this week.”
Demetriou briefly joined York before agreeing a deal to become Keighley’s coach.
The former Wakefield star said: “They’re well coached by Dave Woods, and they’re looking forward to having a good year.
“Their last result wasn’t what they’ll be after, but they ran Featherstone close and that’s the quality we’re expecting on Sunday.”