Moyes took in Atletico's Champions League win over Porto with Koke believed to the subject of his attention.
Afterwards, the youngster said: "I didn't know anything (about Moyes watching on), but I'm not concerned (with any of that). I renewed in the summer."
Atletico sporting director Jose Luis Caminero added: "I suppose he came to see us because Atletico are a Champions League team and because they also qualified for the last 16.
"We spoke, but he didn't tell me exactly why he had come."