Johansen was helped off the pitch at half-time in the 3-0 Scottish Cup quarter-final victory over Morton following a reckless challenge from Michael Miller.
But tests have returned good news for Johansen with a club statement reading: “There was concern at the extent of the midfielder’s injury.
“But the club’s medical team have subsequently ascertained that, while he will miss Saturday’s Glasgow derby away to Partick Thistle, he will hopefully be available for selection the following weekend.”
The champions, going for five titles in a row, travel to Kilmarnock on March 19.