Rivera] League source confirms league-wide retirement of Roberto Clemente's #21 is not happening at this time and there is no current plan in place for it to occur : r/baseball
MLB celebrates Roberto Clemente Day, ceremony at Citi Field
All of MLB's Puerto Rican players can wear No. 21 on Roberto Clemente Day
MLB Ballplayers Can Now Wear #21 Patch on Ballcaps and Helmets – SportsLogos.Net News
Pirates catcher Michael Perez hopes to honor legacy of his idol Roberto Clemente
Kyle Higashioka is Yankees' 2021 Roberto Clemente Award nominee
Roberto Clemente Jr. blasts MLB for not announcing award winner at World Series
Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
MLB celebrates Roberto Clemente Day, ceremony at Citi Field