Silverwood backs Buttler

England coach Chris Silverwood hopes Jos Buttler's return to form in the Twenty20 series decider against South Africa will help revive his Test career in next month's tour of Sri Lanka.

The wicketkeeper-batsman's blistering knock of 57 runs off 29 balls helped England secure a five-wicket win and a 2-1 series triumph on Sunday.

Buttler has struggled in the longest format, however, managing just 158 runs in his last five tests against South Africa and New Zealand.

"Runs breed confidence within a batsman -- to see him come off with a smile on his face in the way he did was superb," Silverwood told British media.