Manchester United manager Ole Gunnar Solskjaer has seemingly aimed a dig at Liverpool counterpart, Jurgen Klopp

Indeed, the start to the season has been both successful and frustrating in equal measure for United after a huge summer spend. While Solskjaer's side do sit joint-top in the Premier League, an early loss in the Champions League and an exit in the Carabao Cup has seen the United boss vent his frustration. 

Last season, much was made about how often his team would win penalties, with perhaps the most famous example coming during a dramatic win over Brighton, when a spot-kick was awarded after the final whistle. 

This time around, Solskjaer has complained about the lack of decisions going his way against Young Boys in Europe, as well as the recent double-header with West Ham United

Back in January, Klopp pointed to the fact that United had more been awarded more penalties in two years than he had in five-and-a-half years at Anfield. 

"I hear now that Manchester United had more penalties in two years than I had in five-and-a-half years," he said (via Sky Sports).

"I've no idea if that's my fault, or how that can happen."

Speaking ahead of United's clash with Aston Villa on Saturday, Solskjaer appeared to fire back. 

"We should have had three penalties in the last two games," he said. 

"There was a certain manager who worried about us getting pens last year and after that it seems like the decisions were more difficult to give.

"I've seen a big difference since then on. You just have to leave it to the refs and hope they make the right calls very soon."

With a meeting between the two bitter rivals only weeks away, the temperature has just been turned up.