Madrid - If Barcelona fail to secure their eighth consecutive Champions League quarter-final appearance, Lionel Messi's failed penalty at Manchester City on Tuesday could well prove their "what if" moment.
Barca were leading 2-1 in the last 16, first leg at the Etihad Stadium thanks to a Luis Suarez brace when Messi stepped up to take an added-time spot kick.
City goalkeeper Joe Hart denied the Argentina captain and gave the Premier League side a much better chance of overturning the deficit in the second leg at the Nou Camp on March 18.