The Republic of Ireland international has already had the opportunity to play alongside the nine new additions and has seen Cabral and David Moberg-Karlsson instantly impress with goals in the Black Cats' 3-1 win over Tottenham in the Asia Trophy.
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"The quality of players that the manager has brought in is pleasing," O'Shea told the club's official website. "Giaccherini has not been here long, but already you can see from his first touch he's got that bit of class – it's very pleasing on the eye.
"His link-up play with the strikers looks good and, if we can get him fully fit and get Jozy Altidore banging in goals, alongside Sess [Stephane Sessegnon], who's looking fantastic, it's going to be exciting.
"We've got a lot more attacking options than we've had before; the new players, [Steven] Fletcher - when he comes back - [Connor) Wickham and Ji [Dong-Won], who's come back from Germany looking a lot sharper.
"There's going to be a lot of competition for places, which can only be a good thing and should see us push our way up the table."