John Hartson joined BT Sport as a football pundit and co-commentator in August 2016.
He can often be heard providing co-commentary when two of his former clubs, Celtic and Arsenal, are in continental action.
John moved into the media after hanging up his boots in 2008 following a playing career that brought over 200 club goals in all competitions, as well as 14 goals in 51 caps for Wales.
He came through the ranks at Luton Town before joining Arsenal in 1995 for £2.5 million - a British record fee for a teenager at the time.
After two years with the Gunners, he moved to West Ham for £3.2 million and also featured for Wimbledon and Coventry in the top flight.
His greatest period of success came with Celtic, where he won three Scottish Premiership titles, notching at least 20 goals in four of the five seasons he spent in Glasgow.
Since retiring, John has worked as a pundit for Setanta Sports, ITV and BBC Radio 5 Live, in addition to his BT Sport role.