Lionel Messi admits that Barcelona need to raise their level after two below par performances for Tuesday's Clasico in the Spanish Cup against a Real Madrid side desperate for a morale boost.Barcelona made an almost faultless start to the season only dropping points in the league before Christmas with a 2-2 draw with Real Madrid at the Camp Nou, while they also lost against Celtic in the group stage of the UEFA Champions League.But now signs of tiredness are beginning to set in."Against Madrid we will have to produce our best football as we will be against a great rival. We need to be at our best in order to get into the final," said Messi, ahead of the semi-final showdown in the Catalan capital with the scores 1-1 from the first leg at the Bernabeu.The teams then go head-to-head again in the league at the weekend but with Madrid trailingBarcelona by 16 points in the table there is little more than pride at stake.
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