Defending Commonwealth 400m hurdles champion Dai Greene doubts whether he will win a medal at Glasgow 2014.
The Welsh athlete has not raced this season after undergoing three hernia operations in 2013.
With round one of his event on 29 July, Greene is still not race-ready and says his medal hopes are out of his hands.
"It depends on how well everyone else is running as to what I can realistically achieve," he said.
"I'm not going to be in the best shape I've ever been in.
I won't know until I'm fully going over the hurdles again, which will happen in the next few weeks.
"There are still five weeks to go and a lot can change in that time."
Greene won gold in Delhi four years ago in a time of 48.52 seconds to edge out defending champion Louis van Zyl of South Africa, with Wales team-mate Rhys Williams winning bronze.
The 28-year-old 2010 world champion captained Great Britain at the London 2012 Olympics.
He just missed out on a medal, finishing fourth and has since been dogged by injuries and illness.
Greene has been named in the for the games in Glasgow, but says he will not be fit for the British Athletics Championships in Birmingham on 27-29 June.
He hopes to run after the Birmingham meeting in a bid to meet the qualifying time for the European Championships in Zurich, which are to be held in August.
"I won't be going to the trials," said Greene, "I'm not going to be ready by that stage.
"I need to run in the next few weeks to get qualification for the Europeans.
"I know when the closing date is, which is halfway through July. So I'll be racing before then.
"After that is the Commonwealths and fingers crossed I'll be in better shape than I am now."