Steve Bruce admitted he was disappointed with the lack of effort from his players during the 5-0 loss to Leicester on Sunday.
The Magpies had already fallen a goal behind when Isaac Hayden got himself sent off for a dangerous tackle on Dennis Praet, with two strikes from Jamie Vardy, Paul Dummett's own goal and Wilfred Ndidi's late effort complimenting Ricardo Pereira's earlier goal.
Speaking to BBC Sport after the game, Bruce admitted his side surrendered far too soon as the Foxes ran riot at the King Power Stadium.
He said: "Effort is a big, big part of the game and we have not done enough.