The BBC sci-fi drama celebrates its 50th anniversary in 2013, with a number of former Who stars rumoured to be making a comeback.
Tennant discussed a possible reappearance on G4's Attack of the Show! while promoting his new BBC Four drama The Spies Of Warsaw.
"I cannot be drawn on anything," he said. "Who knows what will happen next year? I'm sure there are lots of plans being discussed."
He added: "I am not confirming nor denying anything."
Tennant's Tenth Doctor - the show's lead between 2005 and 2010 - was seen lighting the Olympic Flame in 2006 episode 'Fear Her'.
The 41-year-old Scot joked about his absence from the recent London 2012 opening ceremony, saying: "What happened? What went wrong? I was waiting for the phone call... there was an online petition apparently, which the London Organising Committee chose to ignore!"
Doctor Who returns to BBC One this August for a third series with current star Matt Smith.
