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Kieran Tierney proved to Mikel Arteta that he can be his long-term solution at left-back.
Arsenal have been eyeing several options in the position after it becoming a problematic area.
But the Scotland international has been stricken by injuries throughout the season.
Ajax star Nicolas Tagliafico and Real Madrid ace Sergio Reguillon have been reportedly eyed in the past.
But Tierney proved against Sheffield United why he should be trusted to hold on to his position.
The defender was excellent throughout the contest as the Gunners emerged 2-1 winners.
It has set up a semi-final tie in the FA Cup against Manchester City, a game that happened not too long ago and ended up being a pasting.
But with Tierney, the ex-Celtic star exhibits something that has not been seen at the Emirates too often – grit.
A question mark over Arteta’s Arsenal has been their lack of aggression.
Matteo Guendouzi has been touted as that man, but his actions against Brighton screamed out petulance and arrogance rather than steely determination.
But with Tierney, that comes naturally to him.
Do not forget this is a man who became Celtic’s youngest-ever captain in the 2017/18 season.
The left-back has had horrible luck with injuries this campaign and has played just 15 games this season.
A hip injury that needed surgery last summer was compounded by a dislocated shoulder.
Keeping him fit must be a priority, though this is at a club where injuries are reluctantly collected by the day.
Bernd Leno is the latest casualty, in a list that includes Gabriel Martinelli, Calum Chambers and Lucas Torreira.
And while there areas of the squad that are in need of surgery in the transfer market, the left-back is not one of them.
Instead, Arteta must address the problem at centre-back and land a proper defensive midfielder, with Thomas Partey a very realistic option.