Writing in his programme notes, he said: “The news that a player I know very well is committed to staying with them is bittersweet.
“I have been blessed to know Pierre-Emerick Aubameyang and his family for a long time. He is a wonderful person as well as being a wonderful player.
"I say 'bittersweet' about his contract extension because as an opponent who has to face him it makes our jobs so much harder.
“But again, as a football fan and someone who now works in the Premier League, it is so good for the competition to have the very best in the world doing their thing here. He is definitely that.
“So our task today is very clear. We face amazing players, with outstanding football leadership, who are currently in a positive mood. An exciting challenge, I would say."