Ex-Celtic defender Erik Sviatchenko admits he remains connected to his former club but admits his focus is on Midtjylland.
The 29-year-old Danish stopper is a target for his former club as part of new manager Ange Postecoglou 's revolution after leaving Glasgow three years ago.
But he insists he is only concentrating on the upcoming meeting of the two clubs in a Champions League qualifier.
And he believes Celtic will suffer if they have to play the game behind closed doors or in front of a severely restricted number.
He said: "The current Covid restrictions in Scotland would mean Celtic will only be allowed to fill a small amount of their capacity.
Get all the latest Celtic news sent straight to your Inbox every day by signing up to our newsletter.
We cover every morsel of information regarding your favourite club in the form of articles, videos and podcasts.
The newsletter will arrive every day at 12pm, giving you a round up of the best stories we've covered that in the last 24 hours.
To sign up, simply enter your email address into the link here.
And if you aren't already, make sure you join the conversation over on our Celtic Facebook group and Record Sport Instagram.
"If the situation remains the same when we play them in Glasgow, it will be a significant advantage for us.
"It will be an exciting challenge for everyone in and around FC , and of course, it will be extra special for me. I have great feelings for Celtic. I had a really good time in Glasgow.
"The years in Scotland were rewarding and educational. It was my first stay abroad and it gave me good experiences.
"I am still in a Snapchat group with Celtic players like Kristoffer Ajer.
"I had to learn to play for a big European club and on a winning team, where the expectation was that we should win every single match in the league - and that it had to happen in a specific way, where the game appeals to the 60,000 passionate fans in the stands.
"The pressure at Celtic is enormous.
"I think it will be as close as it usually always is in these Champions League playoff matches."
But Sviatchenko, in an interview in a Danish publication, sees plenty of chinks in Celtic's armour.
He pointed out: "Not everything has been going well for Celtic in the last year and a half and they have suffered some defeats lately.
"But they are still a strong team with skilled players who are used to playing the big games under pressure. And they have European football under their skin.
"But it's difficult to assess because neither we nor Celtic knows our finished squads for the season.
"I see it as an advantage that we play away first - it means we can finish our work at the MCH Arena and that's what happened last year when we beat Slavia Prague."