Yes, Celtic really wasted their chances in the first leg, because they should have won that match, because in that match they were the host. But unfortunately Celtic was unable to score in that match, even though they were basically able to dominate the match very well. So in the upcoming second leg, I think Celtic should not waste it again, because basically they are favored to win this match. But even so, I don't think it will be a guarantee that Celtic will be able to win in the second leg. Because in the second leg Kairat will be the host, and of course that will be an advantage for them.

So with that, I think if we bet on Celtic to win it might be a bit risky too. But if we bet on Kairat, it might be much riskier. Because we can see for ourselves that in the first leg they couldn't do much when facing Celtic. So with that, I think this match is really a bit difficult to predict. Maybe if you want to bet, I think BTTS is the most appropriate choice and minimizes the risk. Because I am sure in this match there will definitely be goals. Because this is a decisive match, and both teams will undoubtedly be giving their all and aiming to score. So, given that, I think betting BTTS (Yes) is the right choice.