The serial winner has retained his huge popularity within Old Trafford but lost his place in the XI recently, only to show his character and determination to again become an important cog in the system.
Another polished display against Real Sociedad, in the 4-1 victory that sets up a last-eight tie against Lyon in the Europa League, the 33-year-old was discussed after the game, with Ruben admitting he has had to learn how to get the best out of the South American.
"I think I'm also learning how to use players like Casemiro and, like you said, without a lot of options, we are trying to put our players in the best positions and that helps us a lot," he told TNT Sports.