The "Portman Stand" was built in 1971. This increased the ground's capacity to over 37,000. After the Hillsborough disaster, all bleachers had to be all-seater by law. This meant all terraces had to be converted and the capacity was reduced to about 22,000. Statues of previous Ipswich Town managers Bobby Robson and Sir Alf Ramsey were put outside the stadium in the 1990s. After Ipswich were promoted in 2000 to the Premier League, the ground was expanded to its current capacity of just over 30,000.