Mourinho offered Carrick the role after he decided to hang up his boots at the end of the 2017/18 campaign and the position has taken on greater importance since Rui Faria decided to step down as Mourinhos assistant.
Carrick made just five appeareances last term and was already aiding Mourinhos backroom staff by taking training drills and acting as a coach on matchdays.
However, Carricks fully aware of the demands Mourinho will place on him next season and is using his summer holidays to immerse himself with the Special Ones methods in a bid to hit the ground running.
Metro.co.uk understands Carrick is studying Mourinhos preferred formations and the tweaks the Portuguese boss makes in his team selections when he switches systems.
Carricks familiarity with the first-team squad means hes expected to provided a bridge between the dressing room and Mourinho.
Romelu Lukaku recently credited Carrick with aiding his development throughout last season by talking him through video sessions and Carricks taken a host of analytical player data with him on his break.
The 36-year-old will study the running stats of the United squad over the course of last season and will present his findings to Mourinho the clubs pre-season tour of the United States.
Metro.co.uk revealed in April that Mourinho had spoken to Carrick about the clubs transfer targets and United have since agreed a deal to sign Shakhtar Donestk midfielder Fred.
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Mourinho promoted U18s coach Kieran McKenna to his backroom staff following Farias departure and hes expected to share duties with Carrick.
United hope to conclude a £52m deal for Fred in the next seven days, having already made £19m Portuguese full-back Diogo Dalat their first signing of the summer.