According to the Sunderland Echo, the 16-year-old is also being monitored by German giants Bayern Munich.
It is believed that Mowbray is also keen to bring the youngster to St. Andrew’s, with Birmingham City’s American owners seeing him as a signing that could match their long-term ambition for the club.
Rigg has made seven appearances in the Championship so far this season, all of which have come from the bench.
Rigg initially signed a two-year scholarship deal with the Black Cats last summer.
This was despite attracting serious interest from Manchester United, with the club seeing this as a big seal of approval for their pathway to the first team for young players
Rigg isn’t permitted to sign a professional contract with a team just yet due to his age, but could still be sold to another club.
If he were to walk away from Sunderland at the end of his scholarship deal then the Championship side will be entitled to a fee determined by a tribunal
Given the level of interest in his services, the Wearside outfit will be wary of potentially losing him over the next year.
Once Rigg turns 17 this summer, he will be able to sign terms on a professional contract with any club he chooses, although Sunderland will be compensated should that happens.
Echo, Sunderland future
The midfielder has verbally agreed terms with Sunderland, but has not been able to put pen to paper.
And until he signs on the dotted line, the second tier team will be anxious over the player’s future.
The Black Cats are currently eighth in the table, one point adrift of the play-off places.
Sunderland have also played a game more than their top six rivals Coventry City and West Brom, who both occupy a position inside the play-offs.
Next up for Beale’s team is a home game against Plymouth Argyle on February 10
