The 24-year-old plays for Arsenal in the role once filled by former France captain Vieira, who is now past his prime and not in national coach Raymond Domenech's squad for the June 11-July 11 finals.
The similarities do not stop there.
"I haven't played much, it's true, but I was called up many times," Diaby, a man normally happy to let his football do the talking, told reporters at France's training camp in Tunisia.
Diaby, who has stepped up a gear this season with a string of convincing performances for Arsenal that earned him warm praise from manager Arsene Wenger, has two reasons to believe he is likely to feature in Domenech's plans in South Africa.
"It's tough for Lass because we're really close and were looking forward to living a great adventure together but his misfortune has helped the group bond," Diaby said.
"I like that system better, especially if I don't play in front of the defence but rather on the right or left side (of midfield)," Diaby said.
"I'm proud just being part of that group. There is a great atmosphere and, although I don't talk much, I get on really well with everybody.
"Of course I'd rather play a lot but if I don't, I'll accept it and I'll do my best to help out. The most important thing is not for me to play, it's for the team to win."
