Barring a miracle, Manchester United are likely to have to settle for second place this season.

The Red Devils spent over £150million in the summer acquiring Romelu Lukaku, Victor Lindelof, and Nemanja Matic.

Of course, those additions were blown out of the water somewhat by City's own spree, as they added Kyle Walker, Benjamin Mendy, Bernardo Silva, Danilo, and Ederson to their ranks.

The gap between the two sides is now 15 points at the top of the Premier League, though, which inevitably means United's new boys are going to be scrutinised.

Lukaku, in particular, was charged with transforming them back into title winners, having scored 25 league goals in his final season with Everton.

However, while the £75million man has a respectable tally of 10 in 20 this season, that run has also included long droughts.

In the Belgian's last 19 games, he's found the back of the net just four times and as many United fans will have feared given his reputation at Goodison Park, he is yet to really prove himself as more than a flat-track bully who goes missing in the big games.

As Jose Mourinho looks to rectify his form, the Sun suggest that the Portuguese may have finally got to the bottom of what's been holding him back.

The newspaper claim that Mourinho has expressed concern about Lukaku's weight, with the striker having put on half a stone since his arrival at Old Trafford.

Mourinho is worried 

The medical team have assured him that it is muscle, not fat, which he's been putting on, but because of the amount of time he's been spending in the gym, he's bulked up considerably.

It appears that isn't his only problem with Lukaku either. During their recent run of just two wins in five league games, the United boss feels his star forward has been dropping too deep, when he would prefer him to play further forward.

When he shouted instructions to him from the dugout, he felt the former Chelsea and West Brom man wasn't responding to his demands.

Instead, it's suggested he stood his ground with Mourinho and told him he was trying to create opportunities for himself when chances weren't coming his way.

It sounds like the pressure of what's essentially a non-existent title race is definitely getting to the pair of them.

Where does Lukaku rank among the PL's top strikers? Have your say in the comments.