"We are surprised by the new situation, that Breno will now be investigated. As we do not have any further information we cannot make any other comment," Bayern said in a brief statement on Friday.
The 21-year-old Brazilian, who is recovering from an injury, was alone at home at the time of the fire early on Tuesday and was briefly hospitalised with smoke inhalation after the blaze completely gutted the house in Munich's Gruenwald neighbourhood.
Dozens of fire fighters were called in to put the fire out before it threatened nearby houses.
The club has since found a new home for the player, his wife and three children and the family moved in on Thursday.
Breno joined Bayern as an 18-year-old back in 2008.
Get the best features, fun and footballing frolics straight to your inbox every week.
Thank you for signing up to Four Four Two. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.