What is eating away at Pep Guardiola right now? Maybe, just maybe, the Manchester City manager senses that his era of dominance faces a new threat that is largely of his own creation.
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On one flank, he has Mikel Arteta and Arsenal attempting to claim City's crown as Premier League champions -- the two teams meet for the first time this season in Friday's FA Cup fourth-round tie (3 p.m. ET, stream live on ESPN+, US Only) at the Etihad -- and closer to home, Guardiola can see Erik ten Hag breathing new life into Manchester United to the extent that City's neighbours may finally, after 10 years in the doldrums, be ready to compete for the biggest trophies again.