The FCB boss has been under scrutiny over the club's alleged dip in form, with club president Uli Hoeness and former goalkeeper Oliver Kahn hitting out at the side following the 2-0 Champions League defeat to Arsenal.
Bayern legend Franz Beckenbauer then backed Hoeness, despite the fact that result remains their only loss in 2013 and the Bundesliga leaders still advanced to the quarter-finals of the competition.
"It must be purely in their heads," Kroos told abendzeitung-muenchen.de.
"Everyone is focused and concentrating on the next game in front of us."
The 23-year-old missed the Bundesliga leaders' 2-1 victory over Bayer Leverkusen with a knee injury, but predicts he will be back in action within a week.
"It looks better by the day," added Kroos.
The midfielder will miss Germany's World Cup 2014 qualification double header with Kazakhstan on 22 and 26 March.
Die Roten's next match is against Hamburg after the international break, before they face a tough test against Juventus in the Champions League quarter-finals.