His appointment at Everton was a controversial decision, moving from Premier League rivals Southampton, and he'll need be desperate to hit the ground running at his new club.
And to kick off his debut campaign with the Toffees they face a tough fixture against Tottenham Hotspur.
Worryingly for the Goodison Park faithful, Koeman has stated his players are only at 70 per cent in terms of their fitness.
So who might the Dutchman select for his first competitive starting line up?
Check out talkSPORT's predicted Everton XI, with two key players absent, by viewing the slideshow above.