Charlton completed the signing of 27-year-old Welsh international right-back, Adam Matthews, on Thursday.
Matthews started his career at Cardiff before signing for Scottish giants, Celtic, in 2011.
He made 148 appearancesfor the Bhoys before switching to Sunderland for £2,000,000 in 2015 .
Matthews had a loan spell with Bristol City during his stay at the Stadium of Light.
He said this after completing his one-year deal:
“I’m excited. It’s been a tough summer for me personally, not knowing what was going to happen, so I’m very grateful to have the opportunity to come and train with the boys.
“I want to kick on now and, firstly, stay in the division, but the lads have started really well, so hopefully we can keep that going.
“I know Jonny (Williams) and Tom (Lockyer) well from Wales and I played with Beram (Kayal) at Celtic, so it’s been quite an easy transition for me and I’ve been training with the lads for a few weeks now, so I feel I can slot right in.”
Head of Recruitment, Steve Gallen, added:
“He’s a good right-back who is very attacking and loves getting forward which is something that Lee (Bowyer) was keen on in particular.
“He’s completely proved his fitness and that he’s got a good attitude so he fully deserves the offer of a contract and balances out the squad. We wanted two players for every position and now we’ve finally got that.”