Manchester City booked their place in the last 16 of the Champions League but there were more concerns for Pep Guardiola over his side’s lack of ruthlessness in a 1-0 win at Olympiakos on Wednesday. Phil Foden’s low strike nine minutes before half-time ensured City deservedly kept up their 100 percent record in Europe this season. But a one-goal margin of victory was a scant reward for the visitors’ dominance even with a heavily-rotated side. Guardiola made five changes to the team beaten 2-0 at Tottenham on Saturday to see City off to their worst league start since the first few months of the club’s Abu Dhabi-backed ownership. Scoring goals has been City’s big problem in the Premier League, but they had scored three in each of their opening three Champions League wins over Porto, Marseill...