Manchester United look hot but not bothered during training session in Los Angeles as Hollywood star Julia Roberts drops by for a visit AGAIN

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On another sweltering day in California, the Manchester United squad's spirits seemed to be as high as the mercury.

Jose Mourinho put his players through their paces at the UCLA facility on Thursday and it was short-sleeved order all round as temperatures touched 28C at times.

Romelu Lukaku, Juan Mata and the rest of the Red Devils side kept up their relentless pre-season work-rate despite the scorching conditions, and two famous faces popped by to watch proceedings.

Romelu Lukaku is put through his paces during Manchester United training on Thursday

The United squad stretch off on another gorgeous day in Los Angeles, California

Jesse Lingard leads the way during the training session at UCLA on Thursday

Antonio Valencia sprints during the session, which took place in sweltering conditions

Juan Mata puts his thumb up for the camera, with many of the United players in high spirits

Marouane Fellaini stopped for a picture with Hollywood actress Julia Roberts

United's new biggest fan - the actress Julia Roberts - stopped for a picture with Marouane Fellaini.

Roberts, who visited Old Trafford last season and also dropped in on training on Wednesday, was joined at UCLA by Lord of the Rings actor Dominic Monaghan.

The Hollywood star, who played Meriadoc 'Merry' Brandybuck in the adaptation of JRR Tolkein's epic adventure, posed for pictures with Mourinho and Mata.

Involved in the session in LA was David de Gea, amid news that Real Madrid had re-entered the race for his signature.

Jose Mourinho keeps a close eye on the progress of French midfielder Paul Pogba 

Fellaini had a serious expression on his face as he took part in the session

Lingard stopped to pose for pictures with supporters ahead of the training session

Old Trafford insiders believe a bid is imminent for the goalkeeper from the Spanish giants as the two clubs prepare to meet on their US tour in Santa Clara on July 23.

United want to keep De Gea, 26, and will demand a fee in excess of £60million for the Spain goalkeeper. 

De Gea, who has two years left on his current contract, is open to joining the back-to-back European champions but will not push for a move. 

Fellow Spaniards Ander Herrera and Mata both had big smiles on their faces

Lord of the Rings actor Dominic Monaghan stops to speak to Mata at UCLA

Lukaku gives a thumbs-up to the camera during the pre-season tour session

United were back training at the UCLA facility despite the campus being evacuated due to a bomb scare at 10pm the previous night.

The emergency services swept into action on Wednesday night when a threat was made by phone to the campus police station while Mourinho and his players were several miles away in Beverley Hills. 

There is accommodation available at UCLA for United but they have chosen to stay at The Montage hotel.

Students from more than a dozen halls of residence took refuge in Drake Stadium where United have been conducting daily double training sessions before they were given the all-clear to return to their rooms two hours and 20 minutes later after police with sniffer dogs declared the area safe.