The Sunderland boss said Pritchard showed his quality, but warned he still has work to do to get up to full speed.
The midfielder made his full debut after missing out in their opening league fixture at the weekend and picked up an assist as Josh Hawkes’ scored their first.
"There were three or four glimpses of that magic in his feet," Johnson said.
"He's got that great vision. We know exactly where he is and he's a long way behind the other lads, so I'm delighted that we were able to tick those minutes off and build him up.
"And I thought in a tricky tie, there were a lot of nice moments where we showed that quality, and obviously we want that as consistent as possible now.
"With Alex I think his centre of gravity and obviously his vision is, I think, top level. What we’ve got to do is we’ve got to feed him. We’ve got to trust him with the ball and he can create those moments.”
We gathered the best of today’s transfer speculation below...
1. Arsenal and Villa join race to sign Fulham star
Arsenal and Aston Villa have joined Everton and several other clubs in the race to sign Fulham’s Andre-Franck Zambo Anguissa. The midfielder has been heavily linked with a move away from Craven Cottage this summer following the club’s relegation. (The 72) Photo: Pool
2. Nottingham Forest struggling to tie down star amid Premier League interest
Nottingham Forest are struggling to tie Brennan Johnson down to a new contract. Leeds United, Leicester and Burnley are reportedly interested in the 20-year-old. (The Athletic) Photo: Catherine Ivill
3. Ipswich Town will listen to offers for last season’s top scorer
Ipswich Town are expected to listen to offers for James Norwood this summer. The striker is falling down the pecking order after Paul Cook brought in Joe Pigott, Conor Chaplin and Macauley Bonne. (Football League World) Photo: Nathan Stirk
4. Aberdeen reject £500k offer for Middlesbrough target
Aberdeen have reportedly rejected a £500,000 offer from a Championship club for winger Ryan Hedges. Middlesbrough and Blackburn Rovers have been linked with the player this summer. (Daily Record) Photo: Ian MacNicol