Herrera, 27, has spent two-and-a-half years at United, but feels the club's ability to sign the world's top talent means no player can ever feel secure.
Herrera oo ay da'diisu tahay 27, waxaa uga haray qandaraaska uu kula joogo United laba sano iyo bar laakiin, waxa uu dareemayaa awooda kooxda ee ah la soo saxiixashada hibooyinka dunida ugu sarreeya in ay ka dhigeyso ciyaaryaha walba amaan darro in uu dareemo.