Liverpool coach Jurgen Klopp will be hoping former Borussia Dortmund player Pierre-Emerick Aubameyang doesn't come back to haunt him on Saturday night as the Reds welcome Arsenal to Anfield.
Klopp oversaw a key part of the Gabon attacker's development in Germany after signing him from Saint-Etienne in 2013 with Aubameyang scoring a hat-trick on his Bundesliga debut.
While the duo have long since parted ways, the Liverpool manager is under no doubt about the Arsenal star's quality.
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"It is four years since I worked with him," Klopp said.