Manchester United chief executive Richard Arnold has warned the club will be "disciplined" in their plans to improve facilities at Old Trafford.
The club appointed Populous as master planners to assess options for redevelopment of the stadium earlier this year and are continuing to work on potential options.
Old Trafford has come in for criticism in recent years as it's fallen behind new-built stadiums in terms of facilities and the Glazer family have accepted investment is required.
