Fred is perfect for his new role at Manchester United

They say you should never change a winning team, but Manchester United fans might make an exception given there is a chance to show off a new summer signing when they face Southampton this weekend.

Casemiro has been granted a work permit following his move from Real Madrid, meaning he can now be registered in the latest Premier League squad list and potentially make his debut on the South Coast this Saturday lunchtime.

The 30-year-old arrives at United with a wealth of experience and expertise to offer their midfield, and having already spent pre-season with Madrid, there is little worry about him needing to build up match fitness before he is unleashed by Erik ten Hag.

READ MORE: Casemiro names two players he spoke to before agreeing transfer

Casemiro could go straight into the starting line-up and be able to hold his own, though perhaps the most sensible approach would be to ease him into Premier League proceedings with a bench role this weekend. Given the new five-substitution rules at play, it makes a debut almost a certainty this weekend as long as there are no last-minute issues.

Even if he doesn't start at St. Mary's, it is only a matter of time before he earns a place in the preferred XI, meaning that at least one of those who started against Liverpool will drop out from the start, while those on the bench will fall even further down the pecking order.

It had initially been presumed that Casemiro would partner either Fred or Scott McTominay in the side, with Bruno Fernandes playing in the advanced role. However, the win against Liverpool showed that United can afford to be expansive, with Christian Eriksen also involved from the start.

What is crucial for Ten Hag is to have a destroyer in the deep role and a