Would include them all in preseason, then reassess the situation. Sending out in loan isn't always a great thing, you'd want them to get match time ofc, but sometimes going away sacrifices them learning to play the way needed to fit into the team. Look at Winks at Spurs, they didn't send him out on loan and he's doing fin. Obviously there's always exceptions, but generally you're wanting them to go to a club challenging for promotion rather than a scrap near the bottom