Gakpo, 26, was substituted late on in Liverpool’s 3-3 Premier League draw with Leeds on Saturday (December 6), and it has now emerged it was due to an injury.
The Dutchman is one of several players who didn’t make the trip to Italy for Liverpool’s Champions League clash with Inter Milan on Tuesday (December 9).
Speaking ahead of the game, Slot has now confirmed that Gakpo is set for an extended spell on the sidelines.
“Federico (Chiesa) is ill, that is poor timing you could say but not something you can do anything about,” said Slot on Monday evening in Milan.
“If he has an amazing recovery which doctors don't expect he might travel tomorrow, but that's not what I expect.
“Cody picked up an injury against Leeds and he will be out for a few weeks.”