The Hornets' automatic promotion hopes have been boosted by back-to-back wins over Blackburn and Leicester.
"Things aren't in our hands, we all know that. We need to do what we can do," Anya told www.watfordfc.com.
"The only thing we can control is the three points at the Watford game and then, after that is finished, we can look at the other score."
One of Hull or Watford will be in the play-offs with Brighton, while the pursuit for the final two spots will also go down to the wire.
Crystal Palace harboured hopes of automatic promotion, yet they may miss out on the play-offs altogether due to a nine-game winless run.
However, with a two-point advantage and a superior goal-difference over Bolton and Nottingham Forest, a point against struggling Peterborough should be enough.
The Trotters are in sixth, level on points with Forest, and host Blackpool while Billy Davies' side entertain Leicester, who could also sneak in should they win and Bolton fail to.