Matteo, 45, underwent an operation on a brain tumour on Monday and is currently being treated in hospital after coming out of intensive care.
The thoughts of everyone at the club are with Dom, his family and friends and we will be offering our support to them throughout this difficult time.
A popular member of the Liverpool side in the 1990s and a regular pundit and commentator on LFCTV in recent years, Matteo made his debut for the Reds in October 1993.
He went on to become a regular under Roy Evans and later Gerard Houllier for four seasons from 1996-97, making a total of 155 appearances for the club.