Giráldez was speaking to AS after Celta Vigo's 3-1 win over Elche at Balaídos on Saturday, a result that moved the Galician club back into sixth place in La Liga and kept their European ambitions alive with four games remaining.
Swedberg, 22, came off the bench in the second half, delivered a pass of exceptional quality for Borja Iglesias's decisive goal and drew applause from a crowd that has grown to adore his understated style.
"He's a happy guy. He understands his role, adapts to it and works hard. He is impassive, without emotion or suffering. For me that is an enormous quality that makes him feel he can turn matches, whether he starts or comes on from the bench."
He elaborated on the specific image that has since spread widely across Spanish football media.
"He has started some very good matches, but he has the potential to be someone who changes games. The pass he played today was incredible — a work of art. He does it with an astonishing calm. If you see him before matches, dressed in a jacket and shorts, he looks like a tourist just passing through. The calmer he looks, the better the player he is."
Swedberg has scored nine goals and provided six assists in 37 appearances across all competitions this season, establishing himself as one of La Liga's most interesting young players after joining from Hammarby IF in 2022. He is under contract until 2029.
Atletico Madrid are understood to have registered concrete interest in the player, with Fichajes reporting a potential offer of around €20 million. Celta have so far shown no inclination to sell and regard €12 million as a minimum figure for any negotiation — a number Atlético's reported approach is expected to exceed.
Whether Diego Simeone's use of him primarily as a substitute would suit Swedberg's continued development is a question both player and club will need to consider this summer.