Buttler suffered a calf downside enjoying for Manchester Originals towards Southern Braves final Thursday.
The 31-year-old might now face a battle to be match for England’s white-ball tour of Pakistan, which begins subsequent month.
England are scheduled to play a seven-match T20 collection throughout September and October.
The primary match takes place in Karachi on September 20.
The Originals say Laurie Evans will captain the facet for the rest of the competitors.