He's becoming a bit of a parody of himself really. He sold Mata for similar reasons, though he is trying to build a team that wouldn't suit Mata's style at all.
His digging into Hazard (who was just back from injury) is a bit weak. He was responsible for the goals but he was also one of the few attacking options on the pitch. If there wasn't enough protection for the fullback why was Hazard playing wide to begin with? He had 6 bloody defenders in his starting XI lol.
It seems Chelsea could be selling to buy. The Mata money will cover the Costa transfer and if Hazard does go to PSG he could buy a couple of very good players for the price they will get.