South African fast bowler Morne Morkel is likely to be out of action for about six weeks because of a side strain, team manager and doctor Mohammed Moosajee said on Monday.

Morkel's injury adds to a long list of injured South African fast bowlers, with Dale Steyn, Vernon Philander and Chris Morris already out of action for extended periods.

Moosajee was speaking shortly before South Africa wrapped up victory in the first Test against Bangladesh, the first of a scheduled ten Tests during the home season.

He said Morkel would have scans on Monday but a preliminary assessment was that he was likely to need six weeks of rest.

Morkel left the field after bowling 5.2 overs on Sunday's fourth day of play, during which he took the first two of three Bangladesh wickets which fell before the close.