The Newcastle manager told BBC Sport: "I feel a little bit disappointed we have lost and the scoreline is slightly flattering to them. I felt if we had got an equaliser we could have gone on to win because we looked fitter and stronger.
"Our fans are good judges and I think they've seen enough to believe we're going to give it a real good go this season.
"We'll carry on monitoring the transfer market but we've definitely got a bigger squad and more options. I'm kind of pleased in a way, even though we lost, that we have got a good structure to the team and good fitness in the team."
Newcastle will play Aston Villa next weekend.