Bayern Munich defender Mats Hummels is in advanced talks to make a return to Borussia Dortmund for €30m (£27m), according to Sky in Germany.
World Cup winner Hummels began his career with Bayern before making a move to Dortmund in 2009, following a year on loan there.
In 2016 he returned to the Allianz Arena, having played 309 times for the Schwarzgelben, winning two Bundesliga titles and a German Cup along the way.
The 30-year-old central defender has won seven trophies in his last three seasons with Bayern - including three straight Bundesliga titles.
But Hummels now looks set to leave Munich, with fellow 30-year-old centre-back Jerome Boateng also likely to depart.
Boateng is under contract in Bavaria until the end of the 2020/21 season but was last month advised by club president Uli Hoeness to leave Bayern in order to take up a new challenge.
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