Rankin has suffered a reaction to the metatarsal injury that sidelined him for the first half of last season in which the Bears lifted the LV= County Championship title. But Rankin has now removed the protective boot he has been wearing for the past month and is set to be part of Warwickshire's pre-season trip to Barbados next month.
Brown said: "Boyd suffered a stress reaction to the same metatarsal in his right foot as last season."
He added: "We have caught it early this time so hopefully we are able to nip it in the bud.
"The physio reckons it will take 12 weeks to heal from start to finish.
"He has come out of the protective boot after four weeks and the plan is for him to build things up at the back end of the Barbados trip with a view to being bowling fit for the first game.
"Whether he starts the season we are not entirely sure but that is the plan of action."
Rankin, 28, has retired from playing international cricket with Ireland in the hope of forcing his way into England's plans.
But the injury forced him to withdraw from the Lions tour of Australia.
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