The chance for Cheslea is about 50 percent according to the rates we can see but the chance for Aston Villa is 25 percent and this shows us that even if Cheslea doesn't win this game still Aston Villa can't have too much chance against this team.
Here are the updated rates for this match I think considering the weak performance of Chelsea and the unstable results they got, we can't try betting on a draw.

Not minding the odds that the bookmakers has added to this much. I will say that even if it appears that Chelsea is the favourite in this very match. I do not trust them to win Aston Villa. It would have been fair if Cheslea was able to win Bournemouth last meeting. I do not have a very strong confidence that the present Chelsea team can win any club in English Premier League as it stands now.
Pochettino and his boys should learn to start changing the narratives before it is late. They should stop confusing gamblers. In the other hand, no one should underrate Emry and his boys, I think they lost last time, they may not afford a consecutive lose.