The Scot, now 35, is on a list of eight possible riders in the GB Men's road race squad for the Games. Five of those names will go on to compete, so it is possible that Millar may not race.
Millar, who was banned in 2004 after admitting to doping, is the most contentious name on a strong-looking GB squad.
The British Olympic Association's policy of issuing life-time Olympic bans for drugs cheats was overturned in April by the Court of Arbitration for Sport, allowing Millar to be selected.
18 athletes were formally named by the Great Britain Cycling Team for the Olympics, with several Olympic champions amongst the line-up.
Sir Chris Hoy, Bradley Wiggins, Nicole Cooke and Victoria Pendleton were all included, along with road race world champion Mark Cavendish.
Hoy is up against Jason Kenny for the sole individual sprint berth, but decisions over which cyclists will compete in which event have not yet been declared and are expected to follow 'in due course'.
"We have selected what I believe to be an excellent team going into an Olympic Games and we have a good mix of experienced Olympians alongside young riders who are making their Olympic debut," Britain's cycling performance director Dave Brailsford said in a statement.
"We still have some decisions to make. For example the road teams will be refined in due course and who will ride what event on the track will be determined nearer the time.
"Overall though the GB cycling team has had a strong season across all the disciplines and we are ready to step up again at the Olympics," he added.
The Games start on July 27.
Full Team GB Olympic squad
Cross Country Mountain Biking
Men’s Road (five to ride)
Women’s Road (four to ride)