The 30-year-old defender believes the team has what it takes to push for promotion if they can get through this season without being relegated
Samuel Saiz is playing well for Leeds United this season.
Leeds United are currently in sixth place in the Championship table.
Leeds United are currently in fifth place in the Championship table.
Simon Grayson was tasked with reshaping Sunderland's squad in the summer.
Sunderland striker Josh Maja scored the winner as Chris Coleman's side beat Fulham yesterday.
Brendan Galloway joined Sunderland on a season-long deal from Everton in the summer transfer window.
Sunderland have improved significantly under the stewardship of Chris Coleman.
Simon Grayson was sacked as Sunderland manager in October.
The former Sunderland and Preston North End boss is said to be a strong contender for the Hull City post.