Athletic Bilbao head coach Marcelino acknowledged his players suffered from nerves during their Copa del Rey semi-final against Levante.

Marcelino's side needed an Inigo Martinez equaliser at San Mames after Gonzalo Melero had given Levante the lead as the first leg of the tie finished 1-1 on Thursday.

Athletic were the stronger of the two sides after the break following a timid first-half showing but were unable to find a winner.

The second leg will be played at Levante's Estadio Ciudad de Valencia on March 4, with the winners set to face either Sevilla or Barcelona in the final on April 17.

Athletic still have last season's delayed Copa final against rivals Real Sociedad to play on April 4 and their chance to complete the unprecedented feat of winning the trophy twice in the same month remains a possibility.

They have progressed in nine consecutive knockout rounds in the Copa del Rey - their best run since 11 in a row between 1983 and 1985 (including finals) - but Marcelino said his players must be better in the second leg.

"It may have been anxiety," Marcelino told a post-match press conference.

"We were not comfortable in any facet of the game. We missed simple passes and we were not mobile. 

"In the first half, most of the players were below their level. Then the idea of the game changed and we found ourselves again with what we like.

"It is clear that to be in a final we have to play as in the second half. We must demand more of ourselves.

"Approaching that level of play we can be in the final, but it is clear that we will not be able to drop a level even a minute in Valencia."

Levante boss Paco Lopez insisted his players must forget the second leg, and the prospect of reaching the Copa del Rey final for the first time in their history, and instead focus on LaLiga for the time being.

"We understand that people are waiting for this game but not for us now. There are three weeks in between," he added.

"What we have in the league is the most important thing now and we must put the focus there.

"On March 4 it will come and before we have several games and we are going to have to demand it from ourselves."