British runner Paula Radcliffe's fitness remains touch and go for a shot at a home Olympics medal, according to athletics head coach Charles van Commenee.

Radcliffe, who has yet to win a medal at an Olympics but did place fourth in the 2000 Games in Sydney, is apparently just as likely to compete in London as she is to miss out.

"Paula is always a concern," Sky Sports News quotes Van Commenee as saying. "She has been on a thin line every day for the last decade. Nothing has changed. Shall we flip a coin? Paula is Paula."

Radcliffe's last medal was gold in the 2005 World Championships.