Real Sociedad signed Arsenal left-back Kieran Tierney on loan for the season on Sunday.
The 26-year-old Scotland international joined the Gunners from Celtic in 2019 but fell out of favour behind Oleksandr Zinchenko and new signing Jurrien Timber — who is now injured.
“Playing in the Champions League is an incentive for any footballer,” Tierney told Real Sociedad TV.
“(Playing in La Liga) is a change for me, but I was looking forward to it. I’m passionate about challenges and I’m thrilled to be here.”