Barrera suffered a serious cut in his fight last night:

Ring legend Marco Antonio Barrera (65-6, 43 KOs) won by third round disqualification over emergency replacement Freudis Rojas (1-8-1) on Saturday night at the Auditorio Telmex de la UG in Zapopan, Jalisco, Mexico. Rojas was DQ’d for a headbutt which left Barrera with a bad gash over his left eye. The cut could jeopardize Barrera’s scheduled March 14 clash against Amir Khan in Manchester, England. Barrera was originally slated to face John Nolasco on Saturday night, but Nolasco didn’t show up at the weigh-in, so Marco Antonio was pressed into facing Rojas, whom he knew absolutely nothing about.

HT: Fight News

UPDATE by SC:

The Daily Mail reports that Khan has "been assured" his fight with Barrera is still on, though I don't know how you could guarantee that right now:

Amir Khan has been assured his fight against Marco Antonio Barrera on March 14 is still on despite the Mexican suffering a cut above his left eye on Saturday.

Barrera was butted by Freudis Rojas in a non-title bout in Mexico and initial reports said the cut would need stitches, ruling out a clash with Khan in Manchester next month.