The Celtic captain will appear in person in front of the disciplinary committee as he seeks to have his three-match ban for his kick at Barcelona playmaker Neymar reduced.
Kayal took over from Brown last week as Celtic ignited their Champions League campaign with a win over Ajax. And even if it means he could find himself sidelined if the skipper is successful, he would love to see Brown back in the fold.
He said: "I think we are a better team when Scott plays. He is a real leader for us on the pitch.
"He is a very talented player and he does a great job for the team. He is also my captain and my friend.
"At this club we have 22 or 23 players and sometimes players will come in or players will go out - but I think Scott is one of those players that we miss if he does not play.
"If you are asking me my thoughts then it would be that I am hoping he can get a smaller ban."
Kayal's own displays since coming back into the team may give rise to the suggestion he is capable of keeping his place whether Brown is available for selection or not.
And it is something he admits has crossed his mind.
"I do feel that I am coming back to myself," he said. "And I also feel that I have a lot to prove for Celtic.
"I would like the chance to stay in the team and I do think that both Scott and I can play together - we have done it many times before.
"I am feeling confident again and I am feeling good.
"But I think the main thing for me is to keep working hard on the training ground and in our games. "
Kayal has also revealed mentally he believes he is strong enough now to get back into Neil Lennon's starting XI - and to stay there.
"It is hard when you have been out injured and then you try to force your way back," he said.
"No-one knows except me and the manager how hard I have worked at my game to get myself into the team.
"Now that I have been given a chance I want to take it and I feel good because I have been playing football.
"But to stay in the side means you have to be consistent and that is what I have to bring now to my game.
"I think the supporters have still to see the best of me.
"I am confident that I can get better but if you are playing games every week it gets easier to do that because your match sharpness is there.
"I am feeling better in myself but I think I still need to keep working hard.
"The manager has been good for me. He has had faith in me and I hope now I can repay that."