As a teenager Ritchie had trials with Manchester United, Coventry City, Everton, Middlesbrough and Rangers, but chose to join Celtic in 1971, aged 15. Soon after, Ritchie was 'farmed' out to Junior teamKirkintilloch Rob Roy. At Celtic, Ritchie had numerous disagreements with manager Jock Stein, which led to his transfer to Morton. As part of the transfer, Morton goalkeeper Roy Baines joined Celtic in exchange for Ritchie and a payment of £10,000. Ritchie is most famous for his seven years at Greenock side Morton, during which he scored 118 goals. He was revered by the club's fans and earned the nicknames 'the King of Cappielow Park' and 'The Idle Idol'. He made his debut for Morton on 28 October 1976 and scored 133 goals in 246 games for the club. He was the top scorer in the Premier Division in 1978/79. Ritchie was famous for what, by the standard of most professional footballers, was a rotund build and apparently blase demeanour. Scottish football journalist Chick Young saw Ritchie as "the epitome of the Scottish footballer – a fat, lazy bastard, but with great ball skill". He was renowned in Scotland for his expertise in free-kicks, reputedly perfected by observing Brazil train for the 1974 World Cup. His signature, demonstrated in more than one competitive match, was the ability to bend the ball into the net from a corner kick. His best and most famous goal was scored against Aberdeen at Cappielow Park. In a famous incident Ritchie almost broke his leg falling over Greenock Telegraph photographer, Jim Sinclair, after he failed to stop on a long run up the field. Whilst at Morton, Ritchie won a solitary cap for the Scotland national under-21 football team as an overage player, against Belgium.
Career after Morton
Ritchie was transferred from Morton to Motherwell in 1983. He was player-manager for Albion Rovers in season 1984–85. He retired in 1985, aged 28. Later, he took up a coaching/scouting role for Celtic and subsequent scouting roles for Aston Villa and Manchester City. He became an official SPL match observer A biography, "The King of Cappielow" was published on 11 October 2008. A more warts and all account of Ritchie's life appeared in 'Flawed Genius; Scottish Football's Self Destructive Mavericks'.
Some quotes from the book Greenock Morton 1874–1999 by Vincent P Gillen
"Andy Ritchie – I can close my eyes and see the day as clear as you like. Morton were getting a doing by Dundee Utd and the defence was under siege. Big Andy was standing at the centre circle, hands inside his shirt sleeves, looking at the seagulls, bored out of his skull, when Davie Hayes blootered the ball out – it was just Andy and Paul Hegarty left, and Andy, you couldn't slip a copy of the Greenock Telegraph under his feet when he jumped.
"Big Andy was always full of the verbal – always had a smile on his face, especially when he nutmegged you. I think in fact with the goal he scored in the Scottish Cup, players were always that terrified of Andy nutmegging them that they would shut their legs and he curled it roon them, you know.
"Ritchie came at the right time – he was the cream at the top of the cake at the time...he got the label of being a lazy player and he nurtured that a little bit... I used to train him on his own, he trained hard. He was a character, his skills were unbelievable, his passing, his vision, his dead ball situations.. there was a free kick at a preseason game, we had a wee thing with Watford at the time... and they came about three seasons in a row. I can always remember this one game, Andy had a free kick just over the centre circle...they don't put a wall up or anything and Mick says, it was his first game, "He's not going to shoot from there", just leave him I says, he hits the ball in the roof of the net...he was that good" – Benny Rooney
"I was 26 when I finished. I went into a spell at Cappielow when, rightly or wrongly, I felt I should have been the first player to get a big move. The club had promised me that, if I did well, they would move me again. But that didn't happen. As my team-mates moved on, the good times evaporated and I was left behind. I have to admit my appetite diminished, my general play wasn't good and I lost my way. It was not a conscious decision. In fact, when I moved to Motherwell they didn't want to announce it at Morton because they thought they wouldn't sell season tickets for the next year. I had lost my way. I was what you would call these days a sick pup. I really needed someone to have some faith in me, but I was 26 and ended up taking a non-football job in London and gave up." – Andy Ritchie, Daily Mail, 8 May 2004