This is a common, but increasingly accepted, misuse of English.
Clearly you are correct. "Club" is singular and should be accompanied by the singular "is". However, it's become increasingly common to treat singular group nouns as plural (thus referring to the members of the group collectively) especially when associated with sport.
So you'll often see....
The team are training hard.
The side are arriving by bus.
The club are considering a bid for a new striker .
........and so on.
We might not like it, but it's become acceptable through usage.
buggles (not a teacher)
Student or Learner