Phase 3 of the NFL’s offseason program has arrived. For the first time this year, the 49ers will be allowed to perform team offense versus team defense drills. And though the collective bargaining agreement doesn’t allow live contact until training camp in July, players are permitted to wear helmets starting today — a significant step toward actually emulating football on the practice field.



The next four weeks will feature a number of organized team activity (OTA) sessions, and they’ll conclude with a mandatory teamwide three-day minicamp from June 12 to 14. The 49ers will then break for about a month before opening training camp.



Although final roster decisions are still over three months away, competition for spots certainly ramps up this week. The 49ers recently filled out their 90-man roster — the limit for the offseason — and they’ll have to reduce that number to 53 players by the regular season.



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