United look to shake off defensive woes in Porto

LISBON: European champions Manchester United will probably have to rely on more than another winning goal from teenager Federico Macheda to eliminate Porto from the Champions League on Wednesday.

Macheda, 17, came on as a substitute in the last two Premier League matches to score crucial winners against Aston Villa and Sunderland.

But United will have to tighten up in defence, be more creative in midfield and overcome mental tiredness to eliminate Porto, who surprised many people with their pace and fighting spirit in last week's 2-2 draw in Manchester.