"Liverpool's triumph in the era of the 80s. But now its time United and we always expect a challenge, "said Ferguson was quoted as saying by The Sun, Tuesday (05/17/2011).
"We hope the City is coming. But we always accept the challenge, regardless of any club, "he continued.
City itself is struggling align themselves with United. A number of newer stars brought in by Sheikh Mansour to strengthen his team in recent years.
Positive results had just acquired this season. City won the FA Cup trophy as well as remove their fans thirst for title in 35 years.