Daniel Taylor of The Guardian reported the following almost 7 years ago.
"The issue of Thiago Alcântara also needs clearing up. In his case, it has been portrayed as him snubbing United for Bayern Munich when the truth is actually that Moyes decided he was not entirely comfortable going for the Barcelona player. United had been monitoring him for three years and effectively lined up the transfer but Moyes, as everyone at Everton can testify, likes to have a huge amount of background information on new signings and, having initially gone along with it, decided in the end he did not want to take someone else's word about a player he had seen infrequently. Again, it boils down to a new manager shopping in a new market, with a limited amount of time"
https://amp.theguardian.com/football/2013/sep/04/manchester-united-ander-herrera-transfer-farce