The greatest goalscoring season by a club player in European football is Messi's 73 goals for Barcelona in 60 games in all competitions.
Next is the 66 scored by Gerd Muller for Bayern Munich in 1972-73 and Ferenc Deak for Hungarian side Szentlorinci in 1945-46.
Dixie Dean hit 63 goals in just 41 games for Everton in 1927–28.
Cristiano Ronaldo's best season was the 61 he hit for Real Madrid in 2014-15.
Glentoran celebrate the 96 goals in 47 games Fred Roberts netted in 1930-31, although that includes minor competitions too.
The record for a Portuguese league player is Mario Jardel's 55 - which he remarkably managed for two different teams in the space of three seasons.
The Brazilian, who went on to have a spell at Bolton, hit that total for Porto in 1999-2000 and Sporting in 2001-02.
Gyokeres has scored more goals after 17 games than Messi managed in his record-breaking season - although he is below the figures of Muller and Dean.
His fellow Scandinavian Erling Haaland's best total to date is the 52 he managed for Manchester City in 2022-23.