Borussia Dortmund have called a news conference for 12:30 BST amid reports coach Jurgen Klopp has asked to leave the Bundesliga club.
Reuters news agency reports that the 47-year-old German has asked to be released from his contract, which is due to run until 2018.
German daily Bild said former Mainz 05 coach Thomas Tuchel is to replace him.
Klopp has coached Dortmund since 2008 and took them to the Champions League final in 2012-13.
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