Kieran Tierney does not believe he has anything to "prove" over his fitness as he begins his second spell at Celtic.
The Scotland defender, 28, has joined on a five-year contract, six years after departing for Arsenal.
Tierney has been unavailable for spells over his time both with the Gunners and on loan at Real Sociedad, most recently due to a hamstring injury sustained at last summer's Euros which ruled him out for five months.
Tierney said in response to a question about proving himself as cited by Sports Central: "Nah, nothing because I know how much I work professionally with myself, on my body, on my recovery, being as ready as I can be for games. "So no, I'm not here to prove anything. I'm just here to do the best for Celtic and see where it goes."
He added: "I still think I have the same work rate and determination, which was always my strong point. I try to carry them everywhere I go. "No matter my age, what club or what position I play, I just try to give everything. That's what's got me this far."
Tierney came through the Celtic youth academy and made his debut in 2015 aged just 17.
