The former Manchester United midfielder scored a stunning solo efort in West Ham's emphatic 3-0 victory over London rivals Tottenham at White Hart Lane on Sunday
The former Manchester United bad-boy ran from the halfway line before producing a dinked finish to round off a perfect day for the east London club as they won at White Hart Lane for the first time since 1999.
The 20-year-old joined the Hammers in January 2012 following a string of off-field controversies but he has now forced his way into the first team and been called up for the England Under-21s squad.
"That's a genius goal for me - you will struggle to see a better goal than that all season," said Allardyce to the press.
"A lot of praise is going to come his way and deservedly so. We've seen his qualities all season and that's why it wasn't a great difficulty for me to put him in.
"The penny has dropped in his lifestyle, his attitude towards everybody, his timekeeping and so on and so forth. He doesn't want to do anything other than play in our first team."
Asked what Sir Alex Ferguson had told him about Morrison, Allardyce replied: "He said: I hope you can sort him out because, if you can, he'll be a genius. He can be a top-class footballer but he needs to get away from Manchester and start a new life'.
"He let Ravel go for Ravel's benefit because he couldn't see it happening for him at Manchester United."