If you want to get a long-sleeve Premier League jersey, the selection is not really big.
Premier League Clubs Long Sleeve Availability
Only 25% (or 5 of 20) of the current Premier League clubs offer all three of their shirts in long sleeves in adults & kids sizes - Arsenal, Everton, Manchester City, Norwich, and West Ham. This has been observed by Classic Football Shirts.
Manchester United offer their home a long-sleeve version but only in adult sizes. The away kit is available as a long-sleeve in Kids' sizes only.
Cristiano Ronaldo Wears Undershirt Instead Of Long-Sleeve Kit For Manchester United
70% of the Premier League clubs offer no long-sleeve kits at all.
Should more clubs sell long-sleeve kits? Comment below.