United's somewhat erratic results so far this season show signs of the Premier League's pitfalls.
But Sir Alex says his side's resilience - no doubt added to players coming back into form and with some winning momentum - will stand the Reds in good stead, especially as United are now second and just three points behind leaders Chelsea.
"Teams drop points when you don't expect it," he said. "That's what the Premier League is like. Away from home we've scored seven goals and we've only taken three points.
"It gives you a measure of the quality in the league. The plus points for us are that we kept coming back. That will help us."