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mt1fins

I'm trying to put together a team with as many Chargers as possible.  I upgraded Hayward to an 87, and when I went to set his team Chemistry, there was an option to pick Green Bay as well.  Is there a way on the site here or from the card itself to determine if a player will be eligible for another team chemistry?  For example, how can I check to see if Brees can have a Charger team chemistry?   And is it just the upgraded players that have this option?  Many thanks!!