Fallon died at the age of 90 last week, leaving a legacy which included his time as assistant manager to Jock Stein when the club became the first British team to lift the European Cup in 1967.
Hundreds of mourners attended his funeral service in Glasgow, including Ferguson and famous Celtic faces such as current manager Neil Lennon and a number of current and former players.
Ferguson addressed the congregation at the Church of Christ the King at Kings Park, Glasgow, to pay tribute to "a great man".
He said: "I think it's very difficult for people who are successful to remain humble, it's a touch of greatness.
"Sean always had that greatness. Through his background, his upbringing, his Irishness, that breeds humility and also loyalty, he would never let you down."
Although Ferguson was a supporter of rival Glasgow side Rangers, he formed a strong friendship with Fallon as he built his career as a coach and a manager.
He praised him for his role as assistant manager to Stein and said he was talented in the position, which required him to "get to the heart of the dressing room, make sure you know what's going on and you can help the way that the manager sometimes cannot help".
Ferguson also spoke of Fallon's skill in developing young talent and working with Stein to create arguably the greatest Celtic team of all time. He said: "That was the structure that I think helped Celtic become great and to become the first club in Britain the lift the European Cup."
Among the mourners were other Celtic veterans including Kenny Dalglish and Tommy Gemmell, who scored against Inter Milan when they won the European Cup in 1967. Current players present at the service included captain Scott Brown, Tony Watt, Adam Matthews and Georgios Samaras.
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