Alistair Johnston says it can be very difficult for Celtic in the Champions League because they are 'technically underdogs'.
The right-back has played several times for his side in European football's premier club competition.
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Johnston helped Celtic reach the knockout stages of the Champions League last season, but admits it can be hard coming up against big sides who are unfazed.
He said [One Soccer]: "When you're at a club like Celtic, it's about going out there, no matter how the game is going, chest out, head up, confident.
"Because I know in the Champions League, when you play against a team like Bayern Munich, you feel like you're on top of it, then you look across, and they don't look fazed, how difficult that can be when you're technically the underdog in the match. So it's about us doing that domestically as well and realising that, look, you can win games just on your body language."
Johnston signed a long-term contract at Parkhead last year that will keep him a Celtic player until at least the summer of 2029.
He recently admitted he had to seek the help of a sports psychologist when his form dipped: "I could tell performances were lagging a little bit and I just felt like I was a little overwhelmed," said the Canadian.
"And that’s when I actually started speaking to a sports psychologist and they really helped me with understanding, okay, yeah, being out in public in Glasgow is really difficult. It’s taxing and understanding that.
"And don’t feel like you need to constantly put on a face, but understand that, okay, that is when you leave your front door, it’s gonna be like that. So, you need to have alternate ways to just completely decompress. And that’s when I decided I was gonna move from a flat in the West End and move out and get a house with a private garden and everything, so that we could have the dog running about and just have a bit more privacy.
"And that’s something that I learned is that it was those smaller sacrifices, kind of things like that, that made a big difference for me. Having your own personal space and just finding ways to get away from it. And again, I’m only famous in a 20-mile radius of Glasgow."
