Chris Sutton pointed out that Antonio Conte leave Stanford Bridge if the club can't match his ambition.
'He walked from Juventus when he didn't get his own way. If the club are selling Matic from under his nose then it's not looking great', Button said.
Chelsea had an unsatisfactory pre-season campaign, as the English side only won one of their games against Arsenal while losing against AC Milan and Bayern Munich.
They have struggled in the current transfer window, with Lukaku deciding to sign for Manchester United, and the Blues failing to prise Alex Sandro away from Juventus.