Tom Hamilton of Aerosmith has been forced to leave the band's current tour due to illness. The bassist has returned to the U.S. to recover.

According to Yahoo, Hamilton has a chest infection, leaving him unable to perform. His place will be taken by David Hull, who played bass on Aerosmith's 2006 tour, when Hamilton was recovering from his battle with throat cancer. Hull is also the bass player for the Joe Perry Project.

Aerosmith have four dates remaining on the current leg of the tour, the first time they have performed in Australia in nearly 25 years. They will play two more shows in Australia -- in Brisbane and Melbourne -- then go on to Manila before a final show in Jakarta, Indonesia on May 11. The rock legends will then take some time off before a four-show tour of Japan in August.

Earlier this month, Hamilton made news when he said that he would only consider making another Aerosmith record "under certain conditions." He said he was tired of “examining every single detail of a record” and just wants to “slap on the bass, get the drums rockin’ and the guitars blazing with Steve [Tyler] on those vocals with melodies and harmonies.”