Unlocking Players in Sega Soccer Slam (PS2) — Not Possible

There are no unlockable individual players in Sega Soccer Slam for PS2. The full roster of 6 teams (18 players) is available from the start.

• No hidden characters, no unlock codes, no cheat codes to expand the player roster.
• The game features a few secret teams unlockable via tournament progression (e.g., Team UFO, Team Volta), but these are full teams, not individual player unlocks.

What You Can Do

• Check the manual or in-game team select screen for the complete default roster.
• Search "Sega Soccer Slam PS2 roster" on GameFAQs or similar sites for full team/player lists.
• If you want a soccer game with unlockable players, consider Mario Strikers Charged (Wii), FIFA Street series, or modern FIFA/EA Sports FC modes.