For his Sportsmail column, the ex-Gunners star gave a rundown of what he thinks needs to change in the Manchester United team in the wake of their 4-1 derby loss to Manchester City on Sunday and suggested that Young requires the biggest alteration.
The former Aston Villa winger has come under fire for his recent performances for United and Keown was equally as critical following his poor showing in the weekend's disaster at the Etihad Stadium.
"Probably the most disappointing of the group - he looked lost and gave the ball away so much," Keown wrote of Young.
"Sir Alex Ferguson didn't pick him in the really big games and maybe (David) Moyes shouldn't have done.
"Nani, who was recently persuaded to sign a five-year deal, might have offered better balance to the team and a more attacking threat from the left-hand side.
"He would have cut inside - freeing Evra to run into the channel - and been more threatening than Young, who is a conundrum. He can be hugely successful but then has patches when he is in and out of the side."