Former Arsenal star Pires, 37, says he is edging closer to making a move to the Midlands and should complete a medical in 48 hours.
Pires said: "It's no problem for me to play on Sunday. I've been training with Arsenal for two months and I'm happy and in good form.
"No deal is done yet, nothing's been signed but the talks with Gerard Houllier are going well.
"I just have to convince the team doctor - and, hopefully, I'll sign for Aston Villa before the end of the week."