The veteran midfielder benefited from a small break in action recently and returned to the starting line-up for the 3-2 success at Aston Villa, creating the vital first goal by Javier Hernandez with a defence-splitting pass.
After already prolonging his career following his decision to retire in 2011, there has been inevitable speculation that this term could be his last but the playmaker, who turned 38 on Friday, will obviously keep his cards close to his chest as always.
"There’s not a time to make a judgement on that [carrying on next year]," said Sir Alex. "I think Paul will know himself. But he is still the best passer of the ball in the country. That’s not stopped.
"He has still got the desire to play. He is 38 and Ryan is 39 on 29 November. It’s amazing, particularly with Scholesy, because he has had one or two injuries over the years and he quit last summer and then came back again. He made a fantastic contribution in the second half of last season. I just think he’s doing what he’s doing and he’ll sort it out himself."