Manuel Pellegrini was forced to dodge bottles and savoury snacks when he turned to watch Manchester United v Chelsea on Monday night, reports the Manchester Evening News.
The Chilean was getting familiar with the Premier League champions ahead of his first Manchester derby in four weeks later.
No doubt he was hoping to fly in to Old Trafford under the radar, with fans firmly focusing their attentions on the match ahead.
But he was spotted by United fans when alighting from his car outside the ground. A handful of those fans then decided to throw missiles at the City manager.
Security staff quickly escorted Pellegrini to safety but not before a handful of plastic bottles and a pie was thrown in his general direction.
Manchester City have declined to comment on the incident but Pellegrini has reportedly laughed off the incident and will not take any further action.
The way United stewards handled the situation is said to be key to Pellegrini's decision to move on.
“He was escorted by CES Security staff and had no issues,” Charlie Coxon, safety officer at Manchester United, told the paper.