Pep Guardiola admits Manchester City need to sign a striker

City go into Sunday's derby as favourites, but their current forward line is short of goals against United.

Manchester City manager Pep Guardiola 

Pep Guardiola has reiterated his belief that Manchester City need to sign a striker despite his side sitting top of the Premier League without one.

City will on Sunday face Cristiano Ronaldo, the veteran forward who came close to joining Guardiola's side in the summer before instead making a stunning return to rivals United.