Chelsea team-mates Frank Lampard and John Terry confess taming Newcastle on the return of Alan Shearer will prove a tough test.
Shearer has agreed to take over as Magpies manager for the remaining eight games of the season as the club battle Premier League relegation.
The St James' Park legend, who is set to face the media in a press conference at 1430 GMT, will be in the hot-seat for the first time on Saturday when third-placed Chelsea arrive.
And Lampard - who was a part of the Chelsea side that played Manchester City after the arrival of Robinho in September - expects Shearer to have a significant impact upon spirits on Tyneside.
When asked how difficult a fixture the trip to the North East now represents, Lampard told Sky Sports News: "A lot harder.
"You can imagine the atmosphere up there. Alan Shearer is a God, and quite rightly so. He will get the fans going and the players going.
"Unfortunately for us it seems to happen quite a bit. We had to play Manchester City when they had just signed Robinho.
"We have to react to the atmosphere and be on top of our game to get a result."
Chelsea captain Terry is also expecting a fierce match as the high-flying Blues continue to chase the title.
"He is Newcastle isn't he," Terry said. "So it will give them a big lift. It is down to us to go there.
"The title race is not over yet so we will be going there to upset them."