Preston have sent their congratulations to Arsenal after the Gunners equalled the club's record of going an entire league season without defeat.
North End's team that played in the 1888-89 season were nicknamed "The Invincibles" for their achievement.
The club also won the FA Cup in the same year, without conceding a goal in the competition.
"The Invicibles were a team apart in their era and Arsenal are a team apart in this," said chairman Derek Shaw.
"It is a fabulous achievement, nobody ever thought it would be repeated and the same will probably be thought again now," he told BBC Radio Lancashire.