Shearer is one of the most successful players who donned the Newcastle jersey. When the Newcastle side was hovering in the relegation zone during the 2008-09 season, Shearer was appointed as a manager.
He was given a chance to save the team with eight games left. However, the task proved too difficult for him, and the Magpies got relegated with one point.
He hoped to manage the team in Championship, but he was sacked, and the management hired Chris Hughton for a revamp in Championship.
Julen Lopetegui started his career playing as a goalkeeper for Real Sociedad before moving to Real Madrid to play as a reserve goalkeeper. He had a horrible career for the Madrid team and managed to play in only one game; however, his managerial career was much worse than his playing career.
Lopetegui was hired just one month before the World Cup where he was leading the Spanish team. Though, under him, the Madrid team lost unexpected games at Champions League and went 800 minutes without scoring a goal and lost three consecutive games including a 5-1 drubbing on the hands of their fierce rivals Barcelona.
He was sacked after just spending 138 days in charge.
Graeme Souness was another legendary player at Anfield who managed the club. However, his career as a player provides fonder memories than that of his managerial career.
Souness probably belonged to the last batch of Liverpool players who witnessed regular successes in the league. He won five league titles along with winning three European Cups as a player. Souness as a player also managed to bag four League Cups in the seven-season that he spent as a player at Anfield.
However, when Souness was appointed as a manager to replace Kenny Dalglish, his three years were full of failures.
The one thing for which Souness will be remembered the best would be giving a debut to Robbie Fowler and winning an FA Cup.
However, his managerial career was marred by poor transfers strategies. A controversial interview to The Sun and two consecutive six places finished were what led him to be sacked.
Diego Maradona is the most loved football player in Argentina. (Yes, much more popular than Lionel Messi). Though he did not manage a club, he played for, but his performance as the head coach of Argentina did not inspire much confidence either.
Diego Maradona had a very talented attacking squad at his disposal at Argentina but could not get any international titles to his team. He led the team to the World Cup final, but his tactics were often criticized and his stubbornness to play his Son-in-Law Higuain after having better finishers in the squad in was seen as a sign of Nepotism.
Thierry Henry is one of the most successful French players. He played for Monaco, Barcelona and Arsenal during his playing days and has been one of the biggest legends in Arsenal’s recent history. Henry played 105 games for Monaco after emerging from their youth academy and scored 20 goals.
However, his managerial career wasn’t a successful one. His managed Monaco for 20 games and could lead the team to only two victories. Henry was sacked within three months in charge and left the team languishing at 19th spot.