The striker finished as Galatasaray's top scorer this past season and scored the goal that clinched them the Premier Lig title in Turkey which has led to increasing speculation over his future.
Galatasaray themselves are said to be keen on signing him on a permanent basis but have apparently baulked at the £15m asking price but CompleteSports have claimed that a "top Bundesliga club", believed to be German champions Bayern Munich have "all but agreed" a deal to sign Onyekuru this summer.
Since then, however, another "big" but unnamed German club has entered the equation according to Get German Football News sources who say that Onyekuru's representatives are in talks with two Bundesliga outfits, one being Bayern.
Borussia Dortmund would fit that description but they have recently acquired Thorgen Hazard to replace Chelsea-bound Christian Pulisic while Borussia Mönchengladbach or Red Bull Leipzig (who may yet push to re-sign Ademola Lookman) are also candidates.
The Nigerian international has spent the past two seasons on loan at Anderlecht and in Turkey as he tries to earn a work permit to play in England but there have been suggestions made in the press that he is ready to turn down the chance to finally play for Everton in favour of Champions League football.