Germany Under-19 international
It's reported that the one final detail left to sort out if when exactly the player will move. It had been rumoured that Arp could move at the end of the season even if Hamburg get promoted, although the switch could be halted until 2020.
Bayern Munich are in need of a new striker simply due to Robert Lewandowski's age, while Sandro Wagner's departure in January has increased their need for a new centre-forward.
Long-term target Timo Werner will still be on Bayern Munich's radar even following the revelations about Arp. The RB Leipzig forward is also being touted by Liverpool, but the Bundesliga champions are believed to be ahead in the race for his signature.
Hamburg's Arp has been a revelation at the club ever since his Bundesliga debut last season.
He scored two goals in his first 125 minutes of top-flight football, and many expected that the drop down to the second division would see Arp really come into his own.
But the 19-year-old hasn't found the back of the net in the league this season. His only first team goal since November 2017 came in Hamburg's opening DFB-Pokal match against fifth-tier side TuS Erndtebrück.