Beckham is battling to overcome the ruptured Achilles tendon he
suffered while playing for Milan in March and was at the Emirates
Stadium with his family to see his former club draw 1-1 with
Arsenal yesterday.
But Allegri fears Beckham, 35, will never play for Milan or any
big club ever again.
The AC Milan head coach: "I don't think it's possible that he
will come back.
"He is recovering from a bad injury and at that age it is
difficult to come back.
"But it was a pleasure to see him here."
Allegri's words will give the former England captain no
pleasure, however.
In April, Beckham admitted his recovery was two months behind
schedule and he would not be able to play again until November at
the earliest. That would rule him out of the entire Major League
Soccer season unless his club, the Los Angeles Galaxy, reach the
play-offs.
He had been linked with a return to the Premier League, with
West Ham publicly expressing interest in bringing him back to
England.
But Beckham's agent said no talks had been held and it may be
that Beckham's career as a top level footballer ended on the San
Siro pitch less than five months ago.