A sell-on clause is also retained by the selling club.
Sky Sport Germany reported that Borussia Monchengladbach had completed the deal and scheduled a medical for the 27-year-old, who joins after the most productive domestic campaign of his career.
Lidberg joined Darmstadt from Dutch side FC Utrecht in the summer of 2024 and scored 17 goals and added three assists across 30 appearances in the 2. Bundesliga this season. He confirmed during the campaign that interest was strong and that a summer move was his objective.
Darmstadt's willingness to sell was shaped by the financial reality of Lidberg's contract situation — he had just one year remaining on his deal, which significantly reduced their negotiating power and made a sale at any fee preferable to losing him for nothing next summer.
Mönchengladbach, who finished twelfth in the Bundesliga last season, move for a striker with a proven scoring record at second-division level and with ambitions to test himself at the top of the German top flight for the first time.