Kingsley Coman was forced to leave the field with a hamstring tear during Bayern Munich's game against Hertha Berlin on Saturday, just minutes after coming on as a substitute.
The France international pulled up midway through the second half of the Bundesliga champions’ 1-0 win as he tried to take on Hertha full-back Valentino Lazaro.
The defender didn’t appear to make contact with Coman and Kovac told media after the game that they would need to wait for tests to see the severity of the injury.
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Bayern have since revealed the injury to be to a tear to Coman's hamstring, and that the club expect him to significant time.