A no-trade clause is an amendment to a contract, usually relevant in North American professional sports, wherein a player may not be traded to another club without the player's consent. Sometimes this clause is implemented by the club itself, but the vast majority are requested by the athlete and his sports agent to avoid being sent to a non-contending club and/or a club in an unattractive city. In many cases, these no-trade clauses are limited, where a club may be limited to trading the athlete only at certain times, or only to a certain team or geographical area.