Manchester United birthday boy Nemanja Matic trains with his team-mates for the first time as Jose Mourinho's men prepare to face Sampdoria

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Nemanja Matic has had no time to get used to life in Manchester as the United new boy has been thrown straight into the thick of things on his 29th birthday.

Manchester United's £40million signing took part in Tuesday morning's training session as Jose Mourinho put his players through their paces ahead of the final friendly of pre-season.

Mourinho's men face Italian side Sampdoria in Dublin on Wednesday before taking on Real Madrid in the UEFA Super Cup next Tuesday.  

Nemanja Matic (left) is welcomed to his first Man United training session by another former Chelsea player - Juan Mata

Matic wears the No 31 in Tuesday's session as Manchester United prepare to face Sampdoria in their final pre-season match

(From left to right) Daley Blind, Matic, Ander Herrera and Mata train in the rain as United gear up for their next test

Matic talks tactics with Mata (left) and is all smiles (right) after finalising a £40million switch from Chelsea to United

Matic became United's third summer signing on Monday when Chelsea confirmed his departure to Old Trafford. 

The Serbia international has put pen to paper on a three-year deal at United and they have the option of extending his deal by a further year.

Matic is short of match fitness but could make his first United appearance against Sampdoria, and he has revealed his joy at completing the switch.

'I am delighted to have joined Manchester United,' he told the club's website. 'To work with Jose Mourinho once again was an opportunity I couldn't turn down.

'I have enjoyed my time at Chelsea and would like to thank the club and the fans for their support. I cannot wait to meet my new team-mates and to start training with them.

'This is a very exciting time for the club and I am looking forward to playing my part in creating more history for this great club.'

Mourinho added: 'Nemanja is a Manchester United player and a Jose Mourinho player. He represents everything we want in a footballer; loyalty, consistency, ambition, team player. 

'I would like to thank him for his desire to join us because without that, it would be impossible to have him here. I am sure our players and supporters will love him. A big welcome to our new No 31.' 

Fellow United new boys Romelu Lukaku and Victor Lindelof also took part in the session ahead of United's trip to Dublin on Wednesday. 

Mourinho's side go into the match high in confidence after a comfortable 3-0 win over Norwegians Valerenga on Sunday.

Marouane Fellaini, who Mourinho insists will not be leaving the club this summer, Lukaku and academy graduate Scott McTominay netted as United recorded their fifth win of pre-season. 

United defeated LA Galaxy, Real Salt Lake, Manchester City and Real Madrid - via a penalty shootout - during their tour of America before returning to Europe for their final two games ahead of the new campaign. 

Manchester United ace Romelu Lukaku (left) trains alongside close friend Paul Pogba during the session at the Aon Complex

Victor Lindelof, who also arrived at Manchester United this summer, jogs as Marouane Fellaini is pictured in the background

Antonio Valencia (left) and Anthony Martial used their hoods to cover themselves from the traditional Manchester rain

Manchester United captain Michael Carrick will be hoping to lead his side to their 21st league title this season

Pogba is expected to wear the captain's armband when Carrick is not starting following Wayne Rooney's departure

Henrikh Mkhitaryan will be hoping he can cement a regular place in Mourinho's starting line-up this season

Jesse Lingard (left) was rested against Valerenga but is expected to be given minutes against Sampdoria, while Timothy Fosu-Mensah (2nd right) and Andreas Pereira (right) will also be hoping to impress Mourinho