Chelsea boss Andre Villa-Boas has kept his players' guessing with his different formations throughout preseason.
Blues goalkeeper Petr Cech admits he has no idea how the new Chelsea boss will line up his team in Sunday's game at the Britannia Stadium.
"I think it's fair to say that each player was given more or less the same amount of time to impress, but it's hard to say who will be in the starting line-up against Stoke," Cech told his official website.
"Looking at who started on Saturday you cannot tell and the coaches still have this week to pick the best 11 players.
"We are glad to have won the last friendly too. In pre-season we won all fixtures and that is good for our psyche."
