Manchester City look to have suffered a major injury blow during their FA Cup showdown with Arsenal after centre-back John Stones was forced off with a nasty-looking hamstring scare.
Stones, 28, has become increasingly important to Pep Guardiola and his team since the World Cup, as shown by him playing 90 minutes in eight of their last nine Premier League games.
Amid their ongoing fight for Premier League supremacy this season, City and the table-topping Gunners were pitted against each other in the fourth round of the FA Cup. It gave the main title contenders the chance to lay a glove on each other before two top-flight meetings to come.
But while it was goalless at the break, there was worrying news for Guardiola after Stones went down while stretching for the ball.
With games continuing to come thick and fast in three competitions, City do not have too many concerns on the treatment table, as things stand, especially now Phil Foden is on the road to recovery.
City have nine days before their next match, which comes against Tottenham in the Premier League next Sunday.
Stones nursed a hamstring problem earlier in the campaign.
He has played 17 games for City this season.