For Senior A box lacrosse players (22 and over) in Canada, 2026 season (Lacrosse Canada Regulations, 2026 LC Modifications, World Lacrosse 2026-28 Box Rules). Covers age category, signing deadlines, transfers and negotiation lists, Mann Cup entry, professional player limits, rosters and key game rules.
Under the Lacrosse Canada Regulations, the Senior category is for players aged 22 and over. Junior is 21 and under, Junior Masters is 22-34 and Senior Masters is 35 and over.
Age is the age a player will be in the calendar year (January 1 to December 31) of the current playing season. Senior A is a level within the Senior category, alongside Senior B and Senior C. Players may not affiliate from U17 to Senior lacrosse.
The Lacrosse Canada Regulations say the Senior A championship of Canada (the Mann Cup) is conducted annually under the guidelines of an agreement of the participants, to which all participating Members, qualifying leagues and Lacrosse Canada must be signatories.
The Lacrosse Canada Regulations set an affiliation structure that lets players of affiliated teams compete with the higher-category team in association playdowns, provided the Member sends a list of the applicable affiliations to the national office on or before August 10.
Under the Lacrosse Canada Regulations (Player Eligibility):
Under the Lacrosse Canada Regulations (Inter-Member Transfers, which apply to players aged U17 and older):
Under the Lacrosse Canada Regulations (Inter-Member Transfers), a player can move from one Member to another in these circumstances, among others:
The Player Eligibility section of the Lacrosse Canada Regulations sets a professional-player limit for Senior B only: beginning in 2025, a Senior B team may have no more than three current professional players on its roster (registered with their Member). (For 2024 only, the limit was five.)
Professional players are defined as players who, during the current calendar and/or playing year or season, have been on an active roster for four or more games, or have come off an injured reserve list after one or more active-roster games, or are hold-outs, in the National Lacrosse League (NLL), the Premier Lacrosse League (PLL) or any other professional lacrosse league.
The regulations do not state a corresponding professional-player limit for Senior A teams. Senior A negotiation lists do record hold-outs (Senior A only).
Under the Lacrosse Canada Regulations (National Championships, box lacrosse):
Under the World Lacrosse 2026-2028 Box Lacrosse Official Playing Rules (published on lacrosse.ca):
The Lacrosse Canada "2026 LC Modifications 2.0" list these for Senior A (shared with Junior Women U22, Junior Men A, B and C, and Senior B and C):
For comparison, the base World Lacrosse 2026-2028 Box Rules describe sudden-victory overtime as 15-minute periods after a 2-minute interval, with the first goal winning.
Under the World Lacrosse 2026-2028 Box Lacrosse Official Playing Rules (published on lacrosse.ca):