The 20-year-old has been training at Carrington with the permission of his parent club, who have a close relationship with the Premier League leaders, having taken players on loan in the past.
Red Devils boss Sir Alex Ferguson is keen to take a closer look at the Ghanaian international, who exploded onto the Championship scene when he made his first-team breakthrough last season.
Schlupp - a product of Leicester's youth academy - scored a hat-trick on his senior debut, away at Rotherham United in the League Cup, after impressing in a loan spell with League One Brentford the previous campaign.
As a striker who can also operate wide left, the youngster is highly regarded in football circles, despite his relative inexperience, and the fact he has not featured for Nigel Pearson's side since November.
Schlupp underwent knee surgery last season, but Leicester still offered him a new contract until 2015, which highlights his ability and potential.
A move to Old Trafford might seem a little soon in the player's development, but that hasn't stopped Manchester United from taking a closer look at the promising talent.
The African starlet was actually born in Hamburg, and played junior international football for Germany, and after moving to England as a young boy, he has gone on to build a burgeoning reputation as a possible star of the future.