Stilian Petrov's former captain at Celtic believes Aston Villa's new recruit is a great signing.
Jackie McNamara said: "Paying out £6.5million is a lot of money but shows how highly he is rated.
"Villa will hope it's a bargain and there's every chance it will be if he shows the skills and scores the goals he did at Celtic.
"He will thrive at Villa because he's one of the best goalscoring midfielders out there."