Borussia Dortmund have already tied up deals for Julian Brandt, Thorgan Hazard and Nico Schulz, but Axel Witsel has hinted that there could be more to come.
Having missed out on the Bundesliga title to Bayern Munich in 2018-19, Lucien Favre is determined to ensure that his side are better placed to sustain a challenge next term.
He already has plenty of quality on his books in the form of Witsel, Jadon Sancho, Marco Reus and Paco Alcacer.
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Reinforcements are required, though, and Dortmund have moved early in the window to get fresh faces on board.