Guardiola has worked closely with Vieira as the Frenchman manages City partners New York City FC. Vieira is now being linked with a return to the Gunners following Arsene Wenger's decision to step down at season's end.
Guardiola admitted: “I think Vieira's already a top manager.
"With what has happened, there will be a lot of names and Arsenal will take the best decision for them.
"But of course, Patrick is ready."