Rio Ferdinand may, in hindsight, have accepted that he was a little harsh on Aaron Wan-Bissaka after assessing the Manchester United full-back's development.

In fact, it was a little odd to hear the legendary former United defender criticise Wan-Bissaka for an attribute many others would claim is the strongest in his armoury. Tackling.

"I’d like to see him sometimes not having to resort to slide-tackling because if something happens and it goes the wrong way for you, you’re on the floor and you are out of the game, but when it comes off, it looks exquisite," Ferdinand said.

"In [the PSG] game, Neymar and Mbappe would’ve been going: ‘Who the hell is this guy? — he just kept coming through on the floor.

“I just hope he’s on the training ground, if you had a weakness in your game, you’d know what he’d be working on, because we can all see it. There are no hiding places on the training ground."

Ferdinand may have a point, but it's hardly fair to call Wan-Bissaka's tacking a weakness. He's been near the top of the Premier League's tackle stats for the past two seasons in succession. And in any case the BT Sport pundit may have changed his view after watching United's win over RB Leipzig. Those initial comments were made in the preamble to the game, and 90 minutes later Wan-Bissaka showed his tackling prowess and other aspects to his game too, impressing with his energy and passing range.

Many have cited Ole Gunnar Solskjaer's extra squad depth as the vital ingredient in United's overall improvement this season. The arrivals of Donny van de Beek, Alex Telles and Edinson Cavani have all driven competition for places in their respective positions. And it has been noticeable how the midfield have performed better as a unit in recent games, while Luke Shaw in particular appears to have reached a new dimension since Telles was signed on deadline day.

But Wan-Bissaka is a very different case. It would be wrong to claim United have a true contender to wrestle the right-back berth off the former Crystal Palace star.

The very fact Solskjaer was not prepared to rest Wan-Bissaka until the final few minutes against Leipzig, when Axel Tuanzebe was introduced, said it all. His position is arguably the only one on the pitch where United lack competition after Diogo Dalot sealed a loan move to AC Milan in the summer transfer window.

That is with all due respect to Brandon Williams, who is nominally the second choice right-back at Old Trafford these days, yet has played the majority of his senior football on the opposite side. United are eager to give the 20-year-old more opportunities on the right and hence he played 90 minutes there for the Under-23s against Everton last week.

Williams may well get game time and prove he's a worthy challenger to Wan-Bissaka as the season goes on. Maybe United will need him. Wan-Bissaka surely cannot play twice a week on a continual basis, given the hectic nature of this unique season. You shudder to think how big a loss the 22-year-old would be were he struck down with an injury.

But he seemed to benefit having Dalot as a genuine challenger last season, shaking off the Portuguese and nailing down the first team spot for the season's entirety. That's why we are now in this current predicament.

So Wan-Bissaka's remarkable form, which has come without needing someone to compete for his spot, also serves as a warning to United. After a sticky patch at the end of last season and the start of this one, he has reminded everyone just how good he is, with the scope to get even better.

But perhaps United cannot lean so heavily on one player. They have learned that in other positions of late, which shows that Wan-Bissaka is a complete one-off.