The Terriers will pay an initial fee of £10m for the former Tottenham midfielder.
The report goes on to suggest the clubs are still negotiating about the "finer details" of the deal for the former England Under 21 worldwide, who joined Norwich for a reported £8m in 2016.
Pritchard, a former England U21 worldwide, is expected to undergo a Huddersfield medical on Thursday.
Pritchard, who is under contract at Carrow Road until 2020, has scored eight goals and created 11 assists in 43 games for the Canaries since moving form Spurs in August 2016.
Terriers boss David Wagner previously confirmed his interest in Pritchard but insisted he would not be held to ransom.
The newspaper claims a fee in the region of £11m is close to being agreed, with the 24-year-old already agreeing a four-and-a-half year deal with the Premier League club.
"If it's one new signing with the quality to help us, good". We need to be focused on the quality.