The front row will get that chance at the home of Welsh rugby on Easter Sunday (kick-off 2pm).
Rees said: "It's a weird one because we face Scarlets twice in a matter of weeks. But when I came to Blues it was definitely the first fixture I looked for.
"I targeted getting back for the end of the season; that was a challenge and goal for me and this will be some game for us as a team and me personally.
"Having two games against the Scarlets would be special so to be back involved and play a part in them would be a great experience.
"I like the double header format, with Dragons and Ospreys playing after us, and it's over the Easter weekend so it will be a big occasion," he added. "Hopefully in years to come we will see a double header to start the season off too.
"It's a great atmosphere and not many players get the luxury of playing at the Millennium Stadium. It's a great day all round."
* For this weekend's encounter rugby fans can get their hands on tickets to watch the double-header now from £15 at the WRU website: wru.co.uk/tickets