In a friendly game against Arsenal, Christian Pulisic started out as a right wing-back which is not somewhere that we usually see.
When asked at a post-game press conference if this could be a long-term prospect, Thomas Tuchel replied: "Yes, maybe. He played there with me at Dortmund and we played many times like this with Callum.
"Marcos wasn't able to play today so we put Callum on the left side which I wanted to see from a long time.
"Callum can maybe be more dangerous from this position coming inside which he loves, and which he did today. So you know our situation.
"We have Azpi and Reece for this position [right wing-back] but Azpi only started two days ago and Reece hasn't even started yet.
"So we need solutions because we start on the 11th against Villarreal and on the 14th is the season. We can't try things then so now is the time to see.
"It was the possibility to give him some minutes and from here we go on."
It looks like Pulisic needs a bit more work to be a credible option in that position: the American winger was frequently exposed by the likes of Kieran Tierney at the Emirates.
