Leicester City are the latest club to be linked with former Manchester United and England star Owen Hargreaves, BBC Radio Leicester understands.
The 30-year-old midfielder has been without a club after being released by Alex Ferguson in May.
Boss Sven-Goran Eriksson told BBC Radio Leicester: "I would take him at once if he's fit. He's a great - he was at least - a great, great football player.
"I don't know if he's fit. He hasn't played football in a long time."
Hargreaves made 42 appearances for England but, after signing for £17m from Bayern Munich made just 39 appearances for Manchester United in almost four years.
The Canadian-born midfielder recently used YouTube to post daily fitness videos and has been linked with a possible move to Scottish champions Rangers, newly-promoted QPR and various MLS sides.
"He's been very, very unlucky the last year, so I don't know if he is interested to go on playing or not," Eriksson added.
"I would take him at once to start training with us, of course. Great player."