A spokesman for Ryan told Press Association Sport that the deal had been completed and would be explained in detail at a press conference in London on Thursday.
Twenty-two-year-old Tomlinson is a global star as one member of five-piece boy band One Direction and is a lifelong fan of his hometown club.
He played for their reserve side against Barnsley earlier this year and had been close to a takeover before, but a move was twice delayed because of negotiations over image rights.
They have now been resolved and Ryan's spokesman told the Press Association: "It's done, the takeover is complete."
Source : PA
Source: PA