The 26-year-old has been out of favour on the south coast so far this season and had been expected to leave Fratton Park at some point this month.
Bolton boss Gary Megson told the club´s website, bwfc.co.uk: "Matt is a quality player who is very versatile on the left-hand side. He is a proven Premier League performer who will bring additional quality to our squad."
Copyright (c) PA Sport 2008, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: https://www.givemesport.com/writeforgms