He is Borussia Dortmund's right back and Real Madrid have got their eyes on him as he will return to Real Madrid next summer. In addition, it will be the biggest test the Moroccan will have had to face yet in his career.
Dortmund is happy with his team. He was close to winning the Bundesliga last season and will go for it again this time. Just in case, his side beat Bayern in the Super Cup a few weeks back. But the Champions League is a step further. Both individually and as a group.
There is a lot of spotlight on Signal Iduna Park for Lucien Favre's men. Alcacer, who will face Barca for the first time; Jadon Sancho, sought after by Barca; Marco Reus, who the Catalans ended up negotiating for.
But Achraf also has a very interesting story. He is on loan for the second year running. And, although the Germans love him, he will return to the Bernabeu next season. He has grown and matured there, he has become very important. But this Tuesday, he will be facing a special, but stiff test.
Barca are always tough to beat and even more so when Messi is going to return. Real Madrid will also be watching as he will want to impress them and beat the bitter rival.
That said, based on his recent comments, it seems like he is prepared for his big test.