Rocker Mick Jones has come clean about the real reason behind his 2012 music hiatus, revealing he suffered a "virtual nervous breakdown" after undergoing heart surgery.

The Foreigner frontman took a year off from work after the heart valve operation and blamed the health issue for his extended break, but Jones now admits he was dealing with deeper emotional issues than he initially let on.

He says, "I'd had a virtual nervous breakdown, brought on by a bad prescribing of medication."

Jones explains his personal problems became so debilitating, he was unable to play the guitar for a short time - and he was convinced that was the end of his career.

He continues, "It was a very dark time for me. I literally didn't know where I was anymore. I didn't know who I was. I mean, honestly, I never thought I'd play on stage again.

"I lost the ability to play chords briefly, only for a couple of months. And my brother brought a guitar over for me and said, 'You play guitar. Play it. You're a guitarist. Play the guitar, you know.'"

Jones eventually overcame his issues and has since reunited with former Foreigner singer Lou Gramm to record new music.