Arsenal hero Smith hails Diaby as title difference
Diaby's return to full fitness has lifted everyone at Arsenal this season.
"Although he didn't have a great game last night [against Montpellier], he's a fantastic player.
"With those long legs he can rampage through the midfield, he's a powerhouse. Diaby's had a lot of injury problems but if he can stay fit, he'll make a huge difference."