They may be bottom of the league but they have shown plenty of fight in recent weeks and possess a genuine dangerman in 14 goal Jermain Defoe.
"First of all, [the match] was about the clean sheet".
"We all like the sunshine, well apart from us ginger lads, but I've done NY before [with Everton] and it works".
"That maybe sums us up a little bit, one week we can be so good and another week we can be so bad", Moyes said.
Unlike their hosts, Southampton will want to forget the last Premier League matchday in a hurry after they went down 3-1 at home to West Ham United.
If there could be a ideal moment for Sunderland to meet Southampton this - theoretically at least - seemed very much it.
The defeat last week has really confirmed the idea of the Saints' hangover after reaching the EFL Cup final, with the defeat to West Ham being their third in as many games since beating Liverpool at Anfield to book their place at Wembley. Darren Gibson and Joleon Lescott are both pushing for their first starts in Sunderland shirts.
The Italian was also just the second Southampton player to score in his first two Premier League games for the club, after Henri Camara in February 2005.
The visitors will be without centre half Virgil Van Dijk, as well as frontman Charlie Austin and creative winger Sofiane Boufal. Southampton have been crying out for someone to lead the line all season and Gabbiadini, with his intelligent movement and physical presence, fits the bill perfectly.
Southampton: Forster 6, Cedric 6, Stephens 7, Yoshida 6, Bertrand 7, Romeu 7, Davis 6, Ward-Prowse 6, Redmond 6, Tadic 8, Gabbiadini 8. The Italy global fired past goalkeeper Vito Mannone, making it three goals in two league games for Gabbiadini, who was signed from Napoli.
Manolo Gabbiadini, signed from Napoli last month, was credited with a first-half double yesterday.
Southampton are Sky Bet's 21/10 favourites for the victory with Sunderland up against odds of 11/4 for another win, while the draw is priced at 23/10.