Sunderland made three January transfer window signings, buying French midfielder Alfred N'Diaye from Bursaspor, striker Danny Graham from Swansea, and loaning centre-back Kader Mangane from Saudi Arabian side Al-Hilal.
"The few players he's brought are all high-quality players who add to the squad and the competition," said Colback. "It can only be good that we've got that because with injuries and stuff you need players who can come in and play. We've got that now so hopefully we can get a few wins after the break and start looking up rather than down.
"It's good for the club to see players come in, it gives the players a lift and more importantly it gives the fans a lift. It's good for them to see fresh faces come in. Alfred's done well, he's shown what he's all about, and Danny will get goals."