Is it true that a club linesman has the duty to indicate when a player is offside?

The role of a club linesman, often referred to as an assistant referee, does not entail an official duty to indicate offside according to the Laws of the Game as outlined by FIFA and followed by organizations like AYSO.

In the context of AYSO, a linesman appointed by a club does not have the authority to make offside calls during a match, which is typically the responsibility of the officiating assistant referees. Club linesmen may offer assistance to the main referee; however, their observations and input are advisory rather than authoritative. They may signal for offside if instructed to do so, but they do not hold the same responsibilities as a trained assistant referee in formal matches.

In non-competitive or informal settings, linesmen may be utilized differently, but generally, in sanctioned games, the expectation is that only the designated officials enforce and make decisions on offside occurrences. This clarification helps maintain the integrity and consistency of the game.