Thanks for the file
1. you need to put the DD back for League (it's missing)
2. You have trailing spaces in Teams A2 - remove them
3. you need to create a named range for each teams players, but I think I have a shortcut for that.
a. Go into Name Manager (in the Formula tab) and create a new name, called Player
b. under Refers to, copy this...=OFFSET(Sheet1!$C$1,MATCH(Sheet1!$I$2&"*",Sheet1!$C$2:$C$500,0),-1,COUNTIF(Sheet1!$C$2:$C$500,Sheet1!$I$2&"*"),-1)
This will create a dynamic name list based on the Team you select
4. under Data Validation, select List and in Refers To enter =Player
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