United faltered earlier in the season, before a hot streak of form since January that has coincided with the arrival of Fernandes, who signed for £47million from Sporting Lisbon.United slipped up a number of times early in the campaign, including in a 1-1 draw with Southampton. But they are now on a 17-game unbeaten streak and Hasenhuttl has no doubt why United have improved."In the beginning, people did not underestimate him as he had a very good start and was winning all the games.