Former Celtic boss Neil Lennon was impressed by Tino Livramento for Newcastle United last night.
Newcastle lost 2-0 at Champions League opponents Borussia Dortmund, though fullback Livramento caught the eye of Lennon.
He told BBC Sport: "I thought [Tino] Livramento was outstanding for Newcastle.
"It's the third time I've seen him live and he impresses me every time. He's a wonderful mover and a great athlete.
"Kieran Trippier was struggling a bit at left-back and they brought him over to swap sides. It's not just his defending but the way he breaks forward too.
"For a young player, he looks a great buy."