Missing players in UT

I noticed a player missing from the UT roster from Eredivisie team Feyenoord; Hwang im beom. He arrived at Feyenoord this summer and he is included in Career mode, so I know he is in the game. 

I'm uncertain if there are any other players for which this is also the case, but it seems like a strange oversight. 

Is there any reason this is the case? Will they for some reason not be added to UT until after the Winter transfer window closes?