Barcelona are monitoring Ander Herrera's situation with Manchester United ahead of a possible pursuit in January or in the summer.

Barcelona has become thin in the midfield with the departure of Xavi and the decline of Andres Iniesta.

Marco Verratti and Ilky Gundogan are also of interest.

Herrera was expected to play a big role this season, but Louis van Gaal has preferred Bastian Schweinsteiger and Morgan Schneiderlin.