They laboured to a pair of 1-0 wins over Slovakian minnows Ruzomberok to set up the clash with Split.
The only goal was scored by the Everton's Dominic Nathaniel Calvert-Lewin.
Some also saw the amusing side, but others made more serious points, urging Koeman to use Calvert-Lewin as an out-and-out striker.
The Toffees boss said: "We need two more front players because if you count the players and count the numbers, we lost somebody and we brought somebody in".
The Dutch side were undone by their inability to score over two legs as Petar Bockaj's 25th minute goal put the Croatian club through 2-0 on aggregate.
He is one of the players from that squad eager to make strides at first-team level, but no...
As expected, the visitors once again dominated the ball for long periods but could fashion much in terms of clear cut chances throughout the game and with the new league season getting under away in little over a week, Koeman admits there's still room for improvement. We need to create more than we did'.
Calvert-Lewin replaced Sandro on 69 minutes and nearly immediately created a chance before being dispossessed by the last defender.