The attacker's representative has laughed off suggestions that a meeting took place with the Spanish champions over a proposed move to Camp Nou
A recent Punto Pelota report suggested that the Germany international travelled to the Catalan capital at the weekend to meet with Blaugrana representatives, but the 24-year-old's representative has stressed that there's no truth in the rumour.
"Thomas was definitely not in Barcelona on Sunday," Kogl told AZ.
"There's no truth in this. There have not been any talks with Barcelona and we have not negotiated with them."
Muller is a product of the Bayern youth academy and has developed into a key player at the Bundesliga champions since making his first team debut in 2008-09.
The attacker's current deal with the Bavarians runs until June 2017.