Albion's safety depends on the 21-year-old's future, according to the pundit.
Berahino has been linked with a potential move to both Tottenham and Liverpool by the Daily Mirror and other sources this January.
Keown, however, says keeping the 21-year-old could be the difference between relegation and West Brom's top-flight survival.
It may seem an obvious statement to make from the pundit but West Brom could potentially make a huge profit from any Berahino sale, giving them funds they could use to strengthen their whole squad.
No new signings are guaranteed to be as prolific as Berahino, though, and Keown has pointed out that the Baggies could sell the young striker for an even bigger fee this summer should they keep him now.
"If a huge offer comes in, it may be out of his hands but Berahino’s goals can be the difference between West Brom staying up or going down," Keown said.
"If he stays until the summer, at least he can try to keep his side in the top flight and he would leave with an enhanced reputation and even bigger price tag."
West Brom travel to Everton on Monday night for their next Premier League clash.