The 35-year-old, who has represented South Africa at the 2002 Fifa World Cup, has been a peripheral figure in the Swallows playing set up and looks set to end his career in May.
"I had a discussion with Macbeth on Tuesday and we just briefly discussed his future.
"Those are things he has to decide but I think he will hang up his boots but it is a question of time, I think he will probably do it this year," Marques says.
"My discussion with him was, 'What are you going to do with your life and how can we use you in the club?' Those are things that the club has to take into consideration as well."
Sibaya might retire from playing the game, but the Birds could use the former Jomo Cosmos player as an extra member in their coaching ranks or in an office managerial role.
"There is a lot to discuss but it is all up to Macbeth, I gave him some ideas that I had and I think he will be a great ambassador at the club.
"He has been a great professional, one of the best professionals that I have ever worked with, and I even told him that I will help him wherever I can if he wants to coach in the future I can always mentor him and be part of our squad," said the Swallows coach.
Sibaya has only played three Premiership matches this season after falling behind in the midfield pecking order with young Sibusiso Kumalo now being favoured to partner skipper Lefa Tsutsulupa.