What to watch in UEFA Champions League: Bukayo Saka's strange Arsenal season; Barcelona target 10 wins from 10

After the extended international break, the Champions League is back and gearing up for a rapid run of games. Just over three weeks from now, the league phase will be at its halfway mark, a clearer sense of the European hierarchy having emerged. Then again, we might get a bit of a sense on Tuesday night with several of the big hitters in action. Both Bayern Munich and Barcelona have games that fall into the tough places to go category.