The Australian Olympic cycling team will know by Tuesday whether Cadel Evans rides in Saturday's Games road race.
Evans met with Australian team director Matt White on Sunday before the final stage of the Tour de France.
Last year's Tour champion has struggled with illness in the last few days and finished seventh in his title defence.
He had a disastrous time trial on Saturday in stage 19, finishing 52nd in a discipline where he is normally among the top few.
Evans is also supposed to join Mick Rogers as Australia's entrants in the August 1 time trial at the Olympics.
"We're going to play day-by-day, but on Tuesday we'll make a final decision," White said.
"If he hasn't recovered in the next 48 hours, then we'll look at doing something.
"But at the moment, the plan is Cadel rides the Olympics Games road race."
Evans and the rest of the Australian men's and women's road teams will fly to London on Monday afternoon.
White said while he was confident Evans would recover in time for the Games road race, he was assessing his options.
The reserves for the road team are Heinrich Haussler, Luke Durbridge, Mark Renshaw and Mat Hayman.
It is understood that Australia cannot bring in Richie Porte as a late inclusion.
Porte was the leading Australian in Saturday's Tour time trial, finishing fifth.
If Evans rules himself out, Australia might decide to only enter Rogers in the time trial and bring in a rider to beef up the road race team.
"There's a few different options we can play ... we're going to the Olympics to medal, not to finish in the top eight or to show our presence," White said.
"We're going there to medal, something we haven't done (in the men's road race) since 1972."
When Evans won last year's Tour, there was immense anticipation in Australia that he would compete at the London Games.
The road race course does not suit Evans' strengths, but he will play a support role in the five-man team.
Evans' main chance of winning his first Olympic medal would appear to be the time trial, if he can be ready.
"He's tired, like everyone is - he's obviously still suffering a little bit from the illness he had on the rest day, but he's quite confident he'll be ready for the Olympics," White said.
"He told me as well that if he's not ready by Tuesday, he'll pull himself out ... but he's quite confident."