It has been a strange season so far for Alisson Becker at Liverpool.
Within minutes of his first action having returned for the closing stages of pre-season, the goalkeeper had failed to deal with a straightforward cross against Lyon in a friendly and conceded a penalty as a consequence.
Then came his first Premier League outing of the campaign at home to Norwich City, cut short before half-time by a calf injury that will sideline him for a number of weeks.
Both incidents came after the Brazilian had changed squad number from number 13 to number 1.
Coincidence? No doubt.
But further inspection suggests being first on Liverpool's squad list is fraught with danger over the past few decades.
Alisson took over the jersey from Loris Karius, the German now in the second of his two years on loan at Besiktas.
Karius, of course, moved to Turkey in an attempt to rebuild his career after the personal nightmare of the Champions League final against Real Madrid in Kiev in May 2018, when two dreadful mistakes cost the Reds in a 3-1 defeat.
The number one shirt had been unoccupied for a year before Karius arrived in the summer of 2016.
Simon Mignolet, the regular from 2013 until Karius, wore number 22 throughout his six years at the club.
Instead, Brad Jones was the previous number one, holding the jersey between 2010 and 2014. In that time, though, he made only 27 appearances, the most famous of which was the FA Cup semi-final win over Everton at Wembley in 2012 with Pepe Reina and Alexander Doni suspended.
However, that was significantly more than 10 games Diego Cavalieri managed in his two-and-a-bit years as understudy to Reina, who wore 25 during his time at Anfield.
The Spaniard had taken over as first-choice from Jerzy Dudek, who wore the number one jersey between 2002 and 2007, winning the League Cup and, famously, the Champions League during that time.
His most appearances, though, and arguably most consistent form came in the 2001-02 season, when the Pole was number 12 having joined on the same day as Chris Kirkland after Sander Westerveld, the number one from 1999, made one mistake too many in defeat at Bolton Wanderers.
Westerveld may have won the cup treble the previous campaign, but few have been bombed out of the first team quite as spectacularly.
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David James - at the beginning of a long career - and Bruce Grobbelaar - coming to the end of his - have been the only other Liverpool number ones since the introduction of squad numbers in 1994.
Alisson's form last season in helping Liverpool win the Champions League suggests he is adding to the club's long history of outstanding goalkeepers. Taking the number one jersey, though, clearly has some inherent dangers.
