The England international has enjoyed a breakthrough season at Stamford Bridge, netting 13 Premier League goals before the competition was suspended in March.
“And you have to say that signing Werner would spell the end for Tammy Abraham. I mean goodness knows what is going through his head.
“Allegedly Frank has been telling Werner that he is going to build the team around him so you don't build your team around a wide midfielder.
“You build through the spine so that means straight away that Tammy Abraham is in trouble.
“It's a good move from Frank though because he is trying to take Chelsea from challenging for the top four to competing at the top for the title."