Be ready for matchday 5. Teams won't have much time after their local league starts. This international break should be useful for all teams to regenerate condition, get rid of injuries and try new tactics, unless they have too many international players.
There will be great games, such as Tottenham - Roma, Anderlecht - Porto, Twente - Union Saint-Gilloise, Nice - Rangers and Real Sociedad - Ajax.
We have a quite good idea about standing after matchday 5.