Panesar showed impressive control on day one in Adelaide

England's line-up for the final warm-up game was supposed to be their side for next week's the first Ashes Test.

But Ashley Giles' batting ability may still count in his favour after Trescothick left the tour on Tuesday.

"We wanted Monty if Trescothick was there, because Trescothick added [batting] depth. Now, we might have to re-think it," Fletcher told BBC Sport.

Interview: England coach Duncan Fletcher

Current venue Adelaide is more of a batting-friendly surface than Brisbane, where the first Test begins on 23 November.

Brisbane is considered currently the fastest wicket in the country, confirmed by Australia's decision to pick just one spinner in their 13-man Test squad.

The major factor is to see what the balance of the side looks like Duncan Fletcher

England also look likely to go with four pace bowlers, including all-rounder Andrew Flintoff, and a single spinner.

Giles has not played Test cricket in a year, having undergone three operations on his hip, but offers a better batting option at eight in the order.

Panesar has taken 32 wickets in 10 Tests since then and is seen as the more attacking option.

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He showed impressive control in bowling 22 overs on Friday, conceding just 54 runs for one wicket.

"We're not going to say that side is cast in stone," Fletcher explained.

"The major factor is to see what the balance of the side looks like."

Fletcher also confirmed that Paul Collingwood, who stepped into the side in Trescothick's absence, would take his place in the slip cordon.