The Giants have released running back Alfred Morris, per a club announcement. In addition, the club released cornerback Chris Milton and placed cornerback Jarren Williams on IR en route to the 85-man roster limit. 
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Morris saw 55 carries for 238 yards and a touchdown with the G-Men in 2020. They re-signed him a few weeks ago to bolster the depth chart, but he wasn’t needed following the return of Saquon Barkley. With Barkley installed as the Giants’ RB1, candidates like Devontae Booker, Elijhaa Penny, Gary Brightwell, and Corey Clement will vie for the remaining spots.
All in all, Morris has 6,000+ yards to his credit over nine seasons with the Giants, Cowboys, Washington Football Team, 49ers, and Cardinals.
I don’t know why the Giants didn’t keep Gallman. I think his contract is even cheaper than Booker
Gallman needs to have a lot of carries to be productive, not really a substitute back. Better for him to go and compete for a starting job.
As for Morris, even last year he looked slow, old and wasn’t able to make people miss. Was really surprised they signed him this year, but I guess after seeing the energy and speed that Cory Clement brought there was no use for Morris. Doubt he’ll catch on somewhere else.