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Hopes were high for Kieran Tierney when Arsenal were the team to entice him away from his boyhood club Celtic in 2019, but to say the move has been a success would be generous.

The Scotland international has come up with some memorable moments for the Gunners since his switch and established himself as one of the most important players within Mikel Arteta's system when fit. However, 'when' and 'fit' are very much the key words when discussing Tierney's time in North London.

Arteta is a huge fan of Tierney the player, during the Spaniard's first full season at the helm the left-back was arguably Arsenal's most important attacking outlet - though that is a more a damning indictment of the tactical set-up rather than Tierney's prowess.

The former Celtic hero's problem is clear. When Arsenal have needed him most time and time again, Tierney has been side-lined with an injury of some kind. There's a strong chance that recurring theme is the reason behind Arsenal's reported interest in Ajax defender Lisandro Martinez.

The Argentine is a centre-back by trade, but is so comfortable on the ball he can be deployed on the left and slot in seamlessly. Arteta purchased Nuno Tavares 12 months ago to deputise for Tierney,