Colin Todd is to undergo a heart bypass operation in Denmark, where he works as manager of Randers FC in Denmark's top flight.
The Daily Mail reports that he experienced chest pain during a training camp last week and is now awaiting surgery in Aarhus.
"I'm always positive in my thinking and the staff here at the hospital are keeping a watchful eye on me.
"Being hospitalised is completely new to me but the situation in Denmark is truly amazing, much better than in England."
Todd joined Bolton Wanderers in 1992 as assistant to his predecessor at Middlesbrough, Bruce Rioch.
After Rioch left to manage Arsenal, having achieved promotion in the 1994-95 season, McFarland moved to Bolton as co-manager alongside Todd.
Bolton struggled to cope with the Premier League and McFarland was dismissed in early 1996, leaving Todd in sole charge. He was unable to prevent Bolton's relegation but guided back to the top-flight by winning the First Division in the 1996-97 season, ensuring Bolton's new stadium would host Premier League football.
Despite strengthening the squad with new signings, Bolton struggled in the top flight and were relegated again at the end of the season. Todd led the club to the play-off final in 1999 but lost to Watford, and he resigned seven games into the 1999-2000 season following the sale of Per Frandsen to Blackburn Rovers.
We all wish him a speedy recovery.