Manchester United captain Nemanja Vidic believes he has a long road ahead of him this season before he returns to full fitness.
The centre-back helped United keep a clean sheet in Saturday's 2-0 home win over West Bromwich Albion, his second game back in the side following his three-month absence with a knee injury.
That shutout was only United's fourth in the league this season, and helped the Red Devils maintain their seven-point lead over champions Manchester City at the top of the table.