That has raised doubts over whether Zidane is going to face the same issues as last season, when his side at times struggled to score goals.
Bayern controled the match from the start, while Sevilla were stable in defense and focused on counterattacks.
The 21-year-old replaces Manchester City striker Gabriel Jesus, who has been ruled out of the fixtures with a calf injury.
Roberto Lopez sealed the win in the 94th minute with a powerful shot into the corner after another assist from the impressive Merino.
The fact that the Royal Blues have worn out nine managers in 11 years, at least to some extent, explains David Wagner's hopeless situation. The 48-year-old former Huddersfield manager is the club's 10th incumbent.
After a discussion of around 10 minutes between tournament referees and officials, Djokovic was disqualified from the match in accordance with the rules, even though the 17-time Grand Slam winner had not intended to strike the line judge.
The top seed is to kick off his bid for an 18th Grand Slam title with a first-round game against Sweden's Mikael Ymer.
Around 16,000 spectators were allowed in to watch the game in Budapest's Puskas Arena. Enditem
Earlier this month, Costa Rican team officials said the match would not be possible if the country's health ministry did not provide an exception to a mandatory 14-day quarantine for all travellers arriving from abroad.
"As hard as it was to come to this conclusion, I have so much to look forward to in 2021, including the Olympics. I want to use this time to focus on my game so I can come back stronger and better than ever.
The win came thanks to goals from winger Darwin Machis and veteran Jorge Molina, and means that Granada has won all four of its opening games this season, with two wins in La Liga and two in its first ever appearance in European competition.