The 20-year-old centre-back has made a big impression at Stoke City this season with five goals in 17 league and cup appearances so far.
He was rewarded with the Championship's Player of the Month award for October as a result.
"Terry's the main one, he's a tough defender," Shawcross told the club's website. "I used to model myself on Rio but he's too good on the ball for me."
Despite only having made two appearances for United so far the youngster is benefiting from his experience under Tony Pulis and remains open about an extension to his six-month loan deal.
"At Christmas the two gaffers will have to sit down and decide what I'm going to do," he added. "But for now, I just want to play as many games as I can for Stoke and win as many as we can.
"I came to Stoke for first team experience and that's what I've got.
"Playing against 16 and 17 year olds in the reserve league doesn't really improve you but at Stoke I'm playing against men every week and it's 100 miles per hour. It's a great experience and it toughens you up.
"I've enjoyed it because I've been playing a lot of games and scoring a few goals."