ya!! thats him!! 
From Wikipedia:
Ali Dia was signed by Southampton manager Graeme Souness in 1996,
after Souness received a phone call purporting to be from Liberian
international and former FIFA World Player of the Year George Weah.
"Weah" told Souness that Dia was his cousin, had played for Paris
Saint-Germain and had played 13 times for his country. In actual
fact, none of this was true, and the phone call was from Dia's
agent. Nonetheless, Souness was convinced, and signed Dia on a
one-month contract.
Dia played just one game for Southampton, against Leeds United on
November 23 1996. He came on as a substitute for Matthew Oakley
after 32 minutes, but his performance was spectacularly below
Premier League quality; many would say that Dia was the worst
player to ever play for Southampton. He himself suffered a
substitution (by Ken Monkou) after playing for 53 minutes. Leeds
won the match 2-0.
Dia was released by Southampton two weeks into his contract. He
briefly played for non-league Gateshead, before fading into
obscurity.
He has achieved a notorious status amongst English football fans
for his lack of ability. Ali Dia wore shirt number 33 on his one
and only appearance for the Saints.