We have to have three, so it would mean Touray, Andrésson and Hills getting called up.

Touray probably will, as he's usually in the Gambia squad.

Andrésson would have to be called up for the senior Iceland team, as he wouldn't qualify as a player we could count for postponement if he was called up by the U21s, as you have to have started a certain number of games or played in a certain number of games.

Hills might be called up for the England U20s where the same would apply again.

I'd say it seems unlikely it'll be postponed, but not impossible.