Between the brace conceded at Southampton and the triple scored by Tottenham on Saturday, the Reds defence tightened up to the point that Rio played his way onto ManUtd.com's Player of the Month shortlist.
It represents a fine start to Ferdinand's eleventh season at United and Sir Alex sees no reason to expect it will be his last campaign with the club.
"We're managing Rio's back very well so, touch wood, we've not had any great issues with it," explained the boss in Friday's briefing with the Sunday newspapers.
"He's 33 now and he will be important for us again this season. Ryan Giggs and Paul Scholes are still playing. If he looks after himself, which he's doing well now, and we manage the situation with his back, there's no reason why he can't play on.
"When he first started getting the back trouble, he was out for longer periods than ever before. Now we just take care of him in training. The treatment he's getting and the yoga he's doing is all contributing to him staying fit.
"He's using his experience now, whereas six or seven years ago he had such a great turn of pace. He used to almost leave it until the last second and just turn on the gas and get there. But he can't do that now and, as everyone does, they lose their pace as they get older and he's using his experience to compensate for that. He's not taking any chances now."
Ferdinand is also known to be influential around Carrington, particularly with the rookies trying to work their way up through the ranks.