Lovren hasn't featured for Liverpool since limping off six minutes into their FA Cup third round defeat to Wolves with a hamstring injury five weeks ago and he wasn't a part of the squad that flew out to Marbella for warm weather training this week.
'He is not here for good reasons, because he can not be part of training.
"The league title will be won in defence, I'd hope we win the game on Friday and, if possible, prevent them from scoring", said Kovac.
The situation was unfamiliar and hard for the 20-year-old, but he is confident he will be back in the starting XI soon, having appeared as a substitute in the 3-0 win over Bournemouth on Saturday.
First-choice centre back Joe Gomez is out of action having undergone surgery on a fractured leg, with no timescale put on his return.
Liverpool will host Bayern Munich in the first leg of their last 16 tie at Anfield later this month and many have backed the Reds to beat the German champions over the two legs. But, of course, we have to prepare it differently. "If Dejan gives a sign on Monday â 'I feel brilliant" â then weâd have to think anew, ' Klopp added.
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"We have enough time to recover and we don't want to underestimate the game, because this is a chance to really get into the Bundesliga race". We have to find other solutions'.
The Dutch worldwide has been working away from the main squad during their time in Marbella this week but Wijnaldum trained today so should be back in contention to face Bayern on Tuesday night.
The Netherlands global overcame illness to play in the 3-0 win over Bournemouth on Saturday but missed the opening training sessions in Marbella in order to recover.
"Gini didn't train yet, that's of course not cool after a very intense game for him", he told the club's official website on Thursday.
"So he had a little dip, but will start today so that's good".