The Magpies fielded their strongest starting XI and gave new signing Kieran Trippier a debut he'll never forget as the Premier League giants were knocked out by the League One strugglers.
Joe Ironside scored the only goal of the game as the visitors silenced the 50,000+ fans inside St James' Park.
Newcastle chairman Yasir Al-Rumayyan was in attendance and visited the dressing room along with his fellow directors to voice their support after an embarrassing defeat by a side sitting 41 places below them.
Howe thanked his bosses for their support saying: "I believe they were very supportive to the players, highlighting the fact that they are in this fight to stay in the league together and they're very much behind everybody, and I can't thank them enough for that support.
"It was really beneficial for the players to see that and feel that because this journey that we're going on currently and the fight we're in to stay in the division is a united effort from everybody in the club.
"The supporters are playing their part, no doubt - they've been magnificent - and the owners wanted to show their support for the players, and it was really welcome for me."
Looking back on the game itself, Howe added: "It was a really difficult day for us. A lot of our play was pretty good until the last half but our quality around the box was just missing.
"We put a huge amount of crosses into the box with very limited success. We did create a number of chances, but didn't take them."