In many supporters' eyes he may not deserve it, but Marvin Compper's Scottish Premiership winners' medal has pride of place in his home.

The defender never kicked a ball in anger for Celtic in the league despite Brendan Rodgers splashing out £1million to bring him to Parkhead in 2018. Just over 80 minutes in a Scottish Cup quarter-final against Greenock Morton was all the action the German centre-half saw during his ill-fated spell in Glasgow.

On the field, at least, Compper did not represent anywhere near value for money. A fact the player does not shy away from. He understands fan frustration that his move to Celtic was not a successful one. "Facts are facts," Compper says. "I was brought into Celtic with high hopes, but it was a failed experiment."

The former RB Leipzig star didn't hit the heights and can hardly even be described as a bit-part player for the Hoops. The 34-year-old was brought to Parkhead to provide a wealth of knowledge from his years in the Bundesliga and Serie A with Fiorentina. To add to the already experienced voices of Scott Brown, Mikael Lustig and Craig Gordon within the home dressing room. An aspect of his Celts career that - despite not playing - he believes he did deliver on.

"I was very experienced," Compper told Herald and Times Sport. "I had gone through a lot of pressure situations in my career. So it was very exciting signing for Celtic and, coming to Scotland, it was an adventure. Having finished second the season before with Leipzig, I hoped to give Celtic a part of my experience to help the team grow. Unfortunately it never quite came to that.

"Brendan's vision was for me to be one of the experienced group and help the team be more stable, especially in Europe. If I would have stayed healthy at the beginning, it might have come to that. But when you come to a club and get injured in a training camp and some niggles here and there, the doubts begin to rise.

"By the time I got a training rhythm and would have been ready to get a chance and prove myself, by that time the ship had already sailed. I still had the feeling that I could give the team some experience and I'm convinced I did, on a different level from being on the pitch and playing. I'm sure if some players were asked if I contributed anything to them or their development, some of them might say I gave them advice.

"I showed them some things in training they could implement in their game that helped them become better players. If not being a vital part on the pitch in games, I at least tried to play that kind of role. That was basically the only role I could play in the last seven or eight months at Celtic.

"I speak French, so for those lads I kept a tight relationship and we talked more. I talked a lot to Kris Ajer, so even if I wasn't able to play, I think most of the team still has me in a good place as a person."

On winning the medal without playing any minutes, Compper added: "It was definitely a bit strange. A lot of managers talk about a team being important up to the last player who played 10 minutes in a game. Even if it's a tiny part, they've played their part. For a player with my CV and career, though, that is not enough. A young player like Karamoko Dembele, for example, was very proud and happy they got a medal. For me it was strange because I wasn't able to contribute.

"The impact I had on Leipzig and Hoffenheim promotions was much bigger so there's a huge difference between the two. Ultimately I'm still very proud to have been part of the Celtic squad, part of the history and wearing the colours. Even if it was only in one cup game and training, it still happened.

"I don't have any regrets and I wouldn't make any different decision. It was a good decision to make at that stage in my career, I went to Celtic to play international football and win titles. Even though I have the medal, it's still not the way I wanted to win titles, I wanted to be an integral part of the team, that was the motivation to go to a big team like Celtic."

Injury may well have hampered Compper's arrival, but even after regaining his fitness he was unable to force his way into the starting lineup under Rodgers. Then again under Neil Lennon when the former left for Leicester City. But there is no bitterness from the player's perspective. Even after he was shunted from the first-team dressing room in with the reserves.

He merely wishes he was given the opportunity on the field to prove his worth. "When Brendan left and Neil came in I think he was pleased with my training performances and I was hoping to get a shot under him," Compper went on. "But, if it was a political thing or if he just didn't like me as a player, I will never know. I was sent to the reserves.

"If I had got a chance and didn't perform at the level needed at Celtic, I would have understood that my time was over at that level. But having had a period where I was in shape and ready, and not being in the plans of the manager, that was disappointing. There's no bad blood or anything, it was just very unfortunate circumstances.

"The relationship didn't suffer because at all times [Rodgers] was very clear and honest about it. He told me in late May that it didn't work out as we planned on both sides and that I might consider a move in the summer.

"I was still convinced that I might be able to convince him otherwise. I never reached that goal. The reason he brought me in didn't change. He was still looking for the qualities he thought I could bring."