He then had a spell as manager of Barnsley, helping them win promotion to the Championship in his only full season before he was dismissed in October 2019.
In May 2021 he was appointed manager of Nancy, but was dismissed by the French club in September 2021 Parallel to his last as an active player, Stendel already worked as a co-coach at Hannover 96 II in the 2007-08 season.
[10] On 13 April 2019, following a 4–2 home win over Fleetwood Town, South Yorkshire Police launched an investigation after opposition manager Joey Barton allegedly assaulted Stendel in the tunnel.
[12] At Sheffield Crown Court, in November 2021, Stendel said that he was shoved to the ground by Barton and fell into metal bars in the tunnel.
[17] Stendel had a clause in his contract which meant that it was no longer in effect if Hearts were relegated from the Premiership, and the club appointed Robbie Neilson to replace him on 21 June 2020.