Smith accepts Rangers to lose Beasley for season
"It's not a cruciate injury, he doesn't have to have reconstructive surgery done or anything like that," said Smith. "But it's a couple of ligaments at the side of the knee which need to be operated on.
"You are looking at a three to four-month recovery period after the operation and the awkward part is he would be coming back towards the end of the season. Sometimes you have to balance whether it's worth it or not.
"The worst case scenario is that we can discount him for the rest of the season."