But it has since become clear that Kovač, a former Bayern Munich player, will take over at the Allianz Arena this summer and Heynckes believes that the Frankfurt boss is "predestined" to call the shots in Bavaria.
Wagner tapped home their opening goal after good work from Thomas Mueller on 37 minutes, then added a second with a superb header four minutes later.
The Spanish giants have owned the tournament in recent years, becoming the first club in history to win it in its modern format in back-to-back seasons last year.
"Real again? Incredible!" midfielder Thiago Alcantara told the Bayern website.
Gladbach had appeals for a penalty turned down when Juan Bernat brought down Denis Zakaria in the area.
Facebook CEO Mark Zuckerberg Testifies Before Congress
With controversy surrounding Facebook's collection of users' information, it is possible to find out exactly how much they know. That goes for fake news, foreign interference in elections and hate speech, as well as developers and data privacy, he said.
Wagner made way for Lewandowski and the Poland global tucked Joshua Kimmich's cross past Sommer in the 82nd minute, but he scuffed a chance at the death that would have seen Bayern register six for the third successive Bundesliga home match.
In German media, Kovac is regarded to be only second choice for Bayern.
The Bundesliga have taken a very artistic approach in unveiling new Bayern Munich manager Niko Kovac... using nothing more than a few pencils and a sheet of paper.
Croatian Niko Kovac will take over as Bayern Munich coach next season, succeeding Jupp Heynckes who is leaving at the end of the season, the German champions said on Friday.
Kovac captained Croatia towards the end of his playing career and his brother took over the armband when Niko retired from global football.
"Everyone is professional enough, because we know we can achieve a European place next year - I am convinced of that".
Michael Goolaerts dies after Paris-Roubaix crash
Inevitably, it was the former who took the sprint, adding this Paris-Roubaix victory to that of his 2016 Tour of Flanders win. He was riding in his first Paris-Roubaix race for senior competitors after riding in the under-23 version three years ago.
From relegation danger to the Champions League?
The prolific Portuguese tormented Bayern with five goals last season. The Colombian's reportedly fraught relationship with Madrid coach Zinedine Zidane will no doubt come under the pre-match Marca microscope, and while the sense is that the Frenchman was happy for James to leave, his fellow players seemed less enamoured with the decision.
Germany global Julian Brandt headed Leverkusen ahead on 20 minutes.
After guiding them to an 11th place finish a season ago, they sit just two points behind Bayer Leverkusen for the final Champions League spot.
Hamburg's hopes of avoiding the drop were damaged by a 2-0 loss at Hoffenheim, while Cologne looks doomed after losing 2-1 away to Hertha Berlin.
CWG 2018: Gold Rush As India Wins 4 Medals On Day 10
Kristina O'Hara is beaten on a unanimous points decision by the legendary Mary Kom in 45 to 48 kg category. India won a total of 17 medals today, taking them past the 50-medal mark, and finishing the day with 59.