They are technically called assistant referees.
The referees need a very high level of fitness, as they have to run around for over 90 minutes, they need very good eyes as well and stamina to.
They are the Assistant Referees
when six referees came to be.
players, match officials, Referees, assistant referees, stewards
at senior level (regional ) there is One referee and 2 assistant referees plus a TMO (TV match official) In non regional there is One referee and 2 assistant referees
Generally 3. Referee, and two Assistant Referees. However in higher standards there are sometimes 4. Referee, two Assistant Referees and a 4th Official. In European game, and also International matches, there can be up to 6. Referee, two Assistant Referees, 4th Official and then 2 officials who stand on the goal line.
line men...also known as the ARs (assistant referees)
we should just suck a wistle baby
Fitness. &
There are usually four officials controlling a soccer match: one Referee, two Assistant Referees, and a Fourth Official. In non-professional games, the Fourth Official is usually not present. In some youth games (U10 and below in the US), the offside law is not applied, and so the Assistant Referees are also not used. To confound things more, there is a FIFA sanctioned experiment in the use of two Additional Assistant Referees stationed near the goals (one on each side). There may also be Reserve Assistant Referees who take no part in the match unless an Assistant Referee is unable to continue.
One referee 2 assistant referees and in senior league games a 4th official who monitors subs and time management