Berahino has been linked with Liverpool and Tottenham Hotspur in the Daily Mirror and it seems that he could move on in the near future.
Foster certainly is not expecting Berahino to be at the Hawthorns for too much longer, with the England international stopper admitting that there is little the Baggies can do to retain the services of such a highly-rated and sought-after talent.
“It’s inevitable that big clubs will come in for Berahino as long as he keeps his head down and doing what he’s doing,” he said.
“If he keeps performing then the big clubs will come knocking and, eventually, there will be an offer too good to refuse.”
Berahino's 20-goal haul this season has attracted the attention of clubs across the country, and he certainly seems to have a bright future ahead of him.
Despite still only being 21, the lively frontman looks to be one the most accomplished finishers in the top-flight, and Foster is right in predicting that West Brom could face a struggle to keep hold of him.
With the Premier League's top clubs circling, the Baggies simply do not have the financial muscle to hold on to their key players.
West Brom will be hoping that Berahino sticks around for another season at least, though, as he could be the man that Tony Pulis builds his team around next term.