Andy Murray will head into the Australian Open not knowing whether his match fitness will allow him to go all the way in a Grand Slam tournament.
The Wimbledon champion faces Japan's Go Soeda in the first round on Tuesday.
Murray, 26, said he felt "good" after recovering from lower back surgery in September, but could not gauge his match fitness.
Murray's potential route to glory
Round one: Go Soeda (Jpn)
Round two: Qualifier
Round three: Feliciano Lopez (Spa, 26th seed)
Round four: John Isner (US, 13th seed)
Quarter-final: Roger Federer (Swi, 6th seed)
Semi-final: Rafael Nadal (Spa, 1st seed)
Final: Novak Djokovic (Ser, 2nd seed)
"How many matches do you need before you're feeling 100% match fit? I don't know," said the Scot
"But I played a few matches in Doha , singles and doubles, then obviously I practised a lot here. We'll see when the tournament starts."
Speaking to BBC Scotland, he added: "Right now I feel like I'm a long way from winning the tournament. I don't know how I'm going to feel after playing a five-set match in 40C heat.
"It will be the first time I've done that since the surgery but if I can get myself through a round or two then I'll maybe start to gain confidence and my body will get used to playing matches again."
Murray has played just three exhibitions and two ATP Tour matches since returning to action on 26 December .
As a result, the three-time Melbourne finalist has had to temper his expectations this time.
"I need to be pretty patient with myself and not expect too much," he said.
"But you never know. I've done a lot of training the last few months; it's just I haven't played many matches.
BBC tennis correspondent "A man returning from back surgery can have few complaints about a draw which pairs him with a player outside the top 100 and then a qualifier, in the opening couple of rounds. Andy Murray has played only one truly competitive match since mid-September and will need to be match sharp to face the challenge of the second week."
"So if somehow I can work my way into the tournament, feel a little bit better every day, then I might start to raise those expectations.
Despite his lack of competitive court time, Murray remains ambitious to add to his two grand slam titles after his enforced break.
"I still obviously want to try and keep winning as much as possible," he said. "That's always been the goal.
"I think when you do spend time away from the tour, you feel a little bit fresher mentally without all of the travelling.
"Right now I'm going to be away five months from home. But when I wasn't able to do the travelling, you start to miss it."
Murray will begin against Soeda, the world number 112, with a qualifier waiting in round two, but the Briton is focused solely on Tuesday's opener.
"I haven't played a lot of matches, so I'm not going to look past anyone," he said.