How many goals do Manchester City need to score against Barcelona to qualify for the quarter-final?

City face Barcelona at the Nou Camp at 7.45pm

Manchester City manager Manuel Pellegrini (Getty Images)

Manchester City face an uphill battle against Barcelona in the second leg of the Champions League Last 16 at the Nou Camp tonight.

A win by a two-goal margin will guarantee qualification for Manuel Pellegrini's side, following their 2-1 defeat in the first leg at the Etihad Stadium three weeks ago, but should they score three goals a win by one goal would suffice, such as 3-2.

A 1-0 win would not be enough because of the away goals rule, meaning Barcelona would progress to the quarter-finals on the 2-2 aggregate score.

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A 2-1 win for City would bring the tie into extra-time with the possibility of penalties.

SCENARIOS IF CITY WIN

Barcelona 0 Manchester City 1 (agg 2-2)

Barcelona through on away goals

Barcelona 0 Manchester City 2 (agg 2-3)

Manchester City through to the quarter-finals

Barcelona 1 Manchester City 2 (agg 3-3)

The tie goes to extra-time

Barcelona 2 Manchester City 3 (agg 4-4)

Manchester City through on away goals