New Chelsea boss Antonio Conte was key to their swoop for Marseille striker Michy Batshuayi on Tuesday.
Chelsea had a bid of €40 million accepted by OM after the Belgian had given his approval to the deal.
TMW says Batshuayi was expecting to join Juventus after the Euros - before Conte's intervention.
On Monday, in Paris, Conte's minders held talks with Batshuayi's agents over a dinner meeting for several hours.
And despite their lack of Champions League football, the Belgian agreed to join Chelsea ahead of Juve after learning of Conte's plans.
Chelsea had a doctor fly to Bordeaux on Wednesday to hold a medical for the player as negotiations reached their conclusion.