Barcelona unable to retire Lionel Messi's iconic shirt due to La Liga rules - Daily Star
The Lionel Messi situation proved it – Barcelona need to sell to spend. Who will go? - The Athletic
Why Barcelona Are Unable To Retire Lionel Messi's No.10 Shirt
FC Barcelona's youth academy searches for soccer's next Messi - Los Angeles Times
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Explained: Why Barcelona cannot retire Messi's number 10 jersey - What does the La Liga rule state?
Ronaldinho demands Barcelona retire the number 10 when Lionel Messi retires : r/soccer