The 70-year-old had public spats with the Spaniard during his tenure as Liverpool boss, culminating in the infamous "facts" rant that Benitez undertook during the 2008-09 Premier League title race.
And it seems Ferguson has wasted little time in re-igniting that feud as he feels the former Inter Milan manager is lucky to have the oppertunity to win a second World Club Championship next month - a chance he feels Roberto Di Matteo should have been given following his success last season.
|5/1||Chelsea are 5/1 with Bet365 to win the Premier League title|
"The biggest disappointment for me is that in two weeks' time they are going to the world championship [Fifa Club World Cup]. You would have thought they would have waited to give the guy a chance to win it.
"Rafa Benitez is very lucky because on his CV in two weeks' time he could have two world championships to his name - and has had nothing to do with the teams.
"Jose Mourinho won the treble with Inter Milan. He [Benitez] took over and won the world championship without having to do anything and having nothing to do with the construction of the teams."