The outgoing FCB boss acknowledged the resilience of his side's opponents after digging deep for all three points at the Allianz Arena on SaturdayJupp Heynckes has admitted that Bayern Munich were forced to work hard for their 1-0 victory over Freiburg.
The Bavarians - who made 10 changes from their Champions League semi-final victory over Barcelona on Tuesday - set a new record points tally of 84 in the Bundesliga thanks to Emre Can's sole strike.
And the 67-year-old revealed that he approached the match cautiously, as he praised opposite number Christian Streich for his "sensational" work in establishling the Breisgau-Brasilianer as a top-flight side.
"I issued a warning to my team before we played Freiburg. What [Christian] Streich has achieved with Freiburg is sensational," Heynckes told reporters.
"A lot of things have come together over a period of years for them. It was a job that required hard work, but credit to the lads. We were very smart and very professional."
Bayern have still not dropped a Bundesliga point in 2013 following their win at the Allianz Arena.