Pep Guardiola feels a "second league" would help young players to break into Premier League teams after Brahim Diaz left the club for Real Madrid.
Diaz signed a six-and-a-half-year contract on Sunday having never started a Premier League match, with Goal of the understanding that his deal was worth £15 million ($19m) plus £6.5m in add-ons.
The 19-year-old follows fellow teenager Jadon Sancho away from the Etihad Stadium, with the forward having thrived at Borussia Dortmund by starring in their brilliant first half of the Bundesliga season to earn England caps.
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Guardiola has faced criticism for not handing enough opportunities to young players such as Sancho, Diaz and Phil Foden, who is also yet to be given a start in the Premier League.