The Terriers travel to St James’ Park 14 points from safety and looking doomed already under the former Dortmund youth coach, who replaced David Wagner at the John Smith’s Stadium in January.
Newcastle, meanwhile, are above the drop zone but only just. Rafa Benitez’s side are a single point clear of 18th place and need a result against Huddersfield to give their survival hopes a shot in the arm.
And, in quotes reported by The Chronicle, Siewert has issued a warning for his Huddersfield side, singling out six-goal striker Salomon Rondon as the man who could make the difference.
“Newcastle are physically a very strong team with a tall target player,” Siewert said, referring to the Venezuelan international.
“The wing backs play high up the pitch, which is what we have to deal with. We also have to find solutions.
"The Newcastle United game is like a cup final for us. We need that winning mentality back. We need to start this week. This week is massive for us. We have to pick up points this week.”
Rondon has earned plenty of praise this season for his performances at the tip of Benitez’s attack. He has added a physical presence and scored a few important goals too, including the winner in January’s triumph over Manchester City.
According to the Northern Echo, Newcastle have been told to pay £16 million if they want to sign him permanently for West Bromwich Albion in the summer.
Have something to tell us about this article?