Former Manchester United defender Rio Ferdinand has warned Arsenal and Liverpool that Manchester City look poised to kick on in the second half of the season. Whilst Arsenal were top of the Premier League table on Christmas Day, Liverpool currently find themselves in pole position. At no point, though, will either club have ruled Manchester City out of the title race. Pep Guardiola’s side have won five of the last six Premier League titles. Last season they were an all-conquering force, winning an historic treble, as they triumphed in the FA Cup and Champions League, alongside securing another…