Madrid, Jan. 18 -- Barcelona earned a spot in the quarterfinals of the Copa del Rey on Thursday, but its continued participation in the tournament remains under threat.

Lionel Messi and Ousmane Dembele led Barcelona to a comfortable 3-0 win over Levante at Camp Nou Stadium, helping it advance 4-2 on aggregate. However, the Catalan club could be disqualified for allegedly using a suspended player in the first leg.

Levante said it will make a formal complaint to the Spanish soccer federation on Friday, ahead of the draw for the quarterfinals.

The four-time defending Copa champion has denied any wrongdoing for using youth player Juan "Chumi" Brandariz in last week's match in Valencia.

"We don't have any doubts," Barcelona coach Ernesto V...