Gillespie was quoted in The Sydney Morning Herald saying the Australian team, many of whom are travelling with their families, had been unnerved by the July 7 wave of suicide bombings that killed 56 people on London's transport system.

"If another bomb did go off here in England, there would be serious questions asked, I think, about the tour because I know a lot of the guys are quite nervous," Gillespie was quoted as telling a Melbourne radio station.

The Herald said a full-time security consultant had been with the Australian team since the July 7 bombings and that team officials have decided to continue the tour until they are advised otherwise.

Gillespie though said another bombing could be the final straw.

Australia and England are due to begin the second Test of the Ashes series on Thursday at Edgbaston. Australia, victor in the last eight Ashes campaigns, won the first Test at Lords by 239 runs.