It is not known how long Buttler will be out of action, but having been overlooked by England for the first Test of a four-match series against Pakistan, he will be hoping to return for the limited-overs games in August.
Amir only has himself to blame, says Pakistan batting coach
Despite that Buttler, who has scored England's three fastest one-day international hundreds ever, went on to score a match-winning 50 from just 20 balls, the quickest in Lancashire Twenty20 history.
"X-rays later revealed he sustained a small stable fracture which will be managed conservatively," Lancashire said in a statement.
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