Cheick Tiote admits Newcastle United's derby defeat was a terrible day for the club.
The Toon lost 3-0 at home to Sunderland.
Tiote told the Evening Chronicle: "It is the worst day for the club - for the players, for the fans and for everyone.
"It was difficult for us. We created some chances but we were missing spirit in the team.
"We have had so many games.
"It is the first year we've played in the Europa League and the Premier League.
"Some players are tired and we didn't have enough energy on the pitch."