Former Celtic and Stuttgart defender Andreas Hinkel says he will "have two hearts beating in my chest" when his old clubs face off in the Europa League play-off round.
The sides meet in Glasgow on Thursday night for the first leg before next week's tie in Stuttgart.
Hinkel came through the ranks at Stuttgart and went on to make over 150 appearances for the senior side during a six-year spell at the German club.
The right-back joined Sevilla after leaving Germany before making the move to Scotland were he spent three years at Celtic and made 79 appearances for the Glasgow club during which time he won a league title and a League Cup.
"For me it is a really special game," Hinkel told BBC Scotland.
"When I saw the draw I was really happy, I felt happy for both sides.
"For me it is quite difficult, we have a saying in Germany 'I have two hearts beating in my chest', it is difficult for me to choose one team.
"But it is a special game for me, I had a great time at Celtic, I love this club, I love Stuttgart as well because I grew up here."
It won't be the first time Celtic and Stuttgart face off, in fact it will be the same man in the Celtic dugout as when the sides met over 20 years ago.
That was in the last 16 of the Uefa Cup back in 2002-03 when Martin O'Neill was first in charge of Celtic, the Glasgow club won 5-4 on aggregate following a 3-1 win in the home leg and a 3-2 defeat in the away leg.
"I am looking forward to it because so many people around Stuttgart as well they remember the Uefa Cup game," Hinkel added.
"They remember the supporters, they came to Germany but they remember the atmosphere at Celtic Park as well so I think it will be a great game."
Despite being sidelined through injury for the entirety of his final season at Parkhead, the 43-year-old has nothing but fond memories from his time in Glasgow's east end.
"I would have liked not to get injured in my last year but I couldn't influence it," he said.
"It happened during a training session at the beginning of my last season so that would have been the only thing I would have changed.
"I gave everything for the club, I experienced it as a really special club. It is not a normal club and I still feel part of it. It is like a family, if you are once part of this club or you played for this club you are like a family member."