The best replacement for u21 is san marino.

The best alternatives to u21 are rated as following:
★★★★★  san marino
★★★★★  lithuania
★★★★  serbia
★  belanda u21
★  pakistan u21
★  norway u21
★  italy u21
  leicester u21
  spain u21
  denmark u21

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No companions for u21 have been suggested so far.
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u21
san marino
lithuania