Kieran Trippier has no doubts about Joao Felix's quality after his "unbelievable" header for Atletico Madrid against Manchester United, but he suggested the forward still has work to do to meet Diego Simeone's exacting standards.

Joao Felix's superb diving header gave the Spanish champions the lead in their Champions League clash with the Red Devils, before substitute Anthony Elanga netted to leave the tie finely poised at 1-1 at the halfway point.

The opener represented Joao Felix's 24th goal for Atletico in all competitions but just his second headed goal for the club, with his only previous such effort coming against Cadiz back in November 2020.

Tripper, who left the Wanda Metropolitano for Newcastle United in January, was not surprised by his former team-mate's sublime goal, however.

"It was unbelievable. He can do so many things like that. He has the quality," Trippier told 5 Live.

"We need him to step up, we need him to be the difference. I was surprised they brought him off, because I think that changed the dynamic of the way Atletico Madrid were playing."