Arne Slot probably thought he knew all about Mats Wieffer as a footballer when they worked together at Feyenoord.
But he will see another side of his former player on Monday as his Liverpool side visit the Amex.
Wieffer has been playing as right-back for the first time in his career in recent weeks.
Or as a sort of right-back at times. A clever variation on the theme.
It sounds like that role could continue beyond the current run of games for the Holland midfielder.
Faban Hurzeler certainly believes Wieffer can keep offering that option.
And it is not an option Slot ever took in Rotterdam.
Wieffer himself told The Argus soon after the 2-0 win at Wolves that his right-back stint had started out of necessity.
But Fabian Hurzeler had then told him there was no need to change it.
Speaking ahead of the Liverpool game, the Seagulls head coach said of Wieffer’s role: “I had a conversation with him about that.
“At the beginning, of course, he wasn't really happy, but it's about the team.
“It's most important that every player understands that, no matter where he plays, he needs to help the team.
“And I think Mats does it in an impressive way.
“The more time he plays in this position, the more experience he collects, he's getting more and more familiar with it.
“In my opinion, he has everything to be a really good right-back.
“He has a great physicality, he has good passing skill.
“He can be very dangerous when we attack because he's fast.
“He has a good overview of the whole pitch and I think that he might be an option for us in the future in this position.”
Was Wieffer actually right-back in the way most of us understand the role?
Certainly at Molineux, it seemed a rather harder role to define in football vocabulary.
Most of us who have watched football for a fair amount of time think we know where a right-back should be standing for example, when the opponents take a goal-kick.
Wieffer was nowhere near that position when he won the ball and forced the penalty which led to the Seagulls going ahead.
Ultimately, good passing and touch, aggression, athleticism and football brain should help a player do well in most roles.
Would an out-and-out, old school flying winger cause him problems?
Hurzeler is certainly aware of what Liverpool can do on the flanks.
He said: “They have an unbelievable individual quality regarding their wingers. Not only (Mo) Salah, also (Cody) Gakpo, (Luis) Diaz.”
Gakpo, the former PSV man, has scored in the two previous meetings between Albion and Liverpool this season, each time cutting in from the left and getting the ball on to his right foot.
One finish was a searing shot which flew inside the far post.
The other was an intended cross which bounced rather apologetically inside the upright in front of the Kop.
Gakpo drifted inside fairly token defensive efforts from Jakub Moder in the Carabao Cup and Ferdi Kadioglu in the league.
A Dutch duel between Gakpo and Wieffer down that side could be an interesting sub-plot.
And not one that many of us, least of all Wieffer himself, will have seen coming not so long ago.
