I doubt it's a rumour. Dumoulin doesn't seem to be happy with Sunweb lately but Jumbo also had plenty of issues during the Giro. I'd hate to see him go to Ineos.Dekker_Tifosi said:Latest update: Management Dumoulin is still in talks with Sunweb, no agreement yet, both parties have decided not to talk about anything to the press about this.
Jumbo are rumoured to up their budget to 20€ million to support getting Dumoulin.
More and more it actually looks serious instead of just a rumor.