Manchester City's Manuel Pellegrini, left, Juventus' Massimiliano Allegri, middle, and Arsenal's Arsene Wenger, right, all face pressure to push their clubs forward in Champions League after disappointments in last year's tournament. Here are four storylines to watch for ahead of this week's Champions League matchups.  1. Manchester City's reasons to be cheerful Manchester City's cast list has barely changed, so logic would suggest the final outcome is unlikely to alter when the club faces Barcelona for a second successive season in the last-16 of the Champions League. Yet, City manager Manuel Pellegrini has genuine reason to hope the result can be different this time. A year ago, it...
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