"I hope Ronaldo does not have a good day", said the 72-year-old Heynckes, who coached Madrid to Champions League glory in 1998.
The German club's sporting director, Hasan Salihamidzic, confirmed today that an agreement has been reached with the Eintracht Frankfurt boss.
Kovac will sign a three-year-contract while Ribery and Robben stay for one more season.
Heynckes called Kovac "ready for Bayern as he knows the club and has gained experience working for several clubs and the Croatian national team".
Bayern sports director Hasan Salihamidzic said, "we lost to Real a year ago and meant to do better this time". New boss Julen Lopetegui has played the artful 27-year-old in 15 of his 18 games in charge, and the former Barcelona schemer will be expected to underpin La Roja's title tilt this summer.
Head coach Niko Kovac of Frankfurt gestures during the Bundesliga match between Eintracht Frankfurt and 1.
Kovac has also previously coached Red Bull Salzburg's second side, before taking on the role as assistant of the first team under Ricardo Moniz.
Liverpool fans would've rejoiced when they drew Roma and I do think that if they get past the Italians, they have the tools to hurt Madrid or Bayern in a one-off game.
Harry Kane will learn from negative reaction to disputed goal - Pochettino
October was the last time Alderweireld made a Premier League appearance after spending months out with a serious hamstring injury. I hope that Harry and Christian can rating on Saturday and everybody can be comfortable'. "The goal provides us three points".
"The timing is unfortunate, and the fact information has leaked to the public - certainly not from Frankfurt, but from Munich - is disrespectful, unprofessional". With 40 goals so far, they've already exceeded last season's tally of 36, the task of finding the net being shared equally throughout a team which doesn't feature a standout superstar.
Both Frankfurt and Bayern last week denied that Kovac was on his way to Munich.
"It was a surprise for us in this phase", Bobic said. "Colombia could do well too because they've got some great players". "The players must know each other and respect each other".
He rescued the Eagles from the brink of relegation in his first season, led them to the German Cup final in his second, and has guided them to the brink of Champions League football this year - one of the league's indisputable success stories.
Niko Kovac is on his way to Bayern.