Mark leaves FC Midtjylland for Newcastle this week to join Toon manager Eddie Howe's backroom team.
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Newcastle stated: "The 31-year-old implemented an innovative set-piece strategy that has yielded impressive results under head coach Thomas Thomasberg.
"FC Midtjylland won the 2023/24 Danish Superliga title and finished top of the regular season table once again in 2024/25, with 27 of their 64 league goals scored from set pieces during the most recent campaign.
"The Danish side also reached the UEFA Europa League knock-out stages last season."