Chatting to The Sun, Williams re-ignited a feud between the two rockers, calling Gallagher a “school bully”.
Williams also he admires Gallagher and the career he’s had, but still wants to take him down.
“ He is the voice of a generation, the last of a dying breed, as pop stars are so boring these days,” Williams said.
“But I still want to fight him. He represents a school bully to me and I would like to take the bully down.”
The pair were friends back in the 1990s, and Williams sensationally claimed his “sibling rivalry” with Liam came before he and brother Noel’s rivalry went public.
“We had a sibling rivalry. We were the original Liam and Noel,” he said.
Williams released his new Christmas album The Christmas Present last week.