Allen’s 21-year professional career includes 12 ranking titles – including the 2022 UK Championship – and a stint at the top of the world rankings in 2024.
In his last tournament before this week’s Northern Ireland Open, Allen missed a match-winning black off its spot in the World Championship semi-final against eventual champion Wu Yize.
On Tuesday, Allen was visibly emotional as he admitted he “probably” would not have played had he not been drawn against his friend Brown.
“I’m not OK, but I’m OK in that itself. I’ve been much worse in the last few months than you saw yesterday.
“My daughter kept me going, the therapists, staff and all the other patients were amazing and helped me through some really dark days.”
He added: “I also know it won’t happen overnight. I’m a work in progress!
“My fight and determination on the table has always been there for ones to see. I need to show those same fighting qualities off it now for a while.”
Allen also praised Brown for handling Tuesday’s match with “grace and skill”, adding he is “proud to call him a friend”.
He also thanked those who have sent him messages of support and added: “This is only the beginning of my new journey.”
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