Poels indicated last month that he would be moving on from Omega Pharma-Quick Step after just one season despite team CEO Patrick Lefevere wanting to keep him.
The 26-year-old signed a one-year deal with the Belgian team after his Vacansoleil-DCM team folded at the end of 2013. It was reported that Poels was in negotiation with Belkin but Poels' salary demands put a stop to discussions. Poels would be the first Dutch rider to sign for Team Sky.
The Dutchman's addition would strengthen Sky's support for Chris Froome in the mountains.
Poels is currently riding the Vuelta a España.