Chelsea midfielder John Obi Mikel appealed to abductors on Monday for the safe return of his father after he was abducted in Nigeria last week.
The 24-year-old Nigerian international played in Sunday's season-opening 0-0 draw at Stoke City despite knowing his father Michael was abducted on Friday.
In an interview with Sky Sports News, Mikel said: "We haven't heard anything, no phone calls, nothing.
"Whoever has got my dad or knows where my dad is, please contact me and hopefully he will be released. Please let him go — my dad is an old man and he hasn't done any harm to anyone as far as I know and I don't know why he has been taken.
"This happens a lot, not in the northern part of Nigeria but in the eastern part. It's a very safe place where we live in Jos, I think it's a first that my father has been taken in the northern part," the midfielder said.
Mikel, who has never managed a Premier League goal for Chelsea, came close to scoring against Stoke with a long-range volley that goalkeeper Asmir Begovic tipped over the crossbar.
"It was really difficult. I spoke to the manager [Andre Villas-Boas] who asked me if I wanted to play the game and I said I wanted to play," explained Mikel who joined Chelsea in 2006 and won a league winner's medal last year.
"I didn't want to let my team down or the club down or my family. If I didn't play I think my mum would have been very sad with me.
"I've told some of my teammates today, but most of them didn't know on Sunday. I didn't want everyone coming up to me saying 'oh sorry Mikel', I just wanted to get on with the game."
Chelsea's Young Player of the Year in 2007 said everyone back home knows he is a professional footballer.
"We live in a very safe and secure place in Nigeria, so this is a real shock to me," said Mikel. "Me and my brother [in England] still cannot believe it.
"I don't know what to do at this point. It is very difficult for me."
Mikel said he would like to return to Nigeria but had been advised on safety and security grounds to remain in England.
Earlier, his management company The Sport Entertainment & Media Group said no ransom demand had yet been received from the kidnappers.
Chelsea said in a statement: "We will give Mikel and his family our full support at this most difficult time."
It is not the first time a relative of a Premier League player has been abducted in Nigeria after former Everton defender Joseph Yobo's brother was kidnapped in 2008.
(Additional reporting by Sonia Oxley)
