Mowbray said: "Filipe is a creative midfielder from Portugal. He's a talented, very technical player who we identified and we're delighted he's joined us. He will hopefully play a big part in what we are trying to achieve."
Teixeira started his career at Felgueiras before moving to French Ligue One club Istres in 2001. He then enjoyed a spell alongside Ronaldinho at Paris Saint-Germain before moving to Coimbra in 2005.