Sunderland have signed Scotland midfielder Liam Bridcutt from Brighton on a three-and-a-half-year deal for an undisclosed fee.
Bridcutt joins his former boss Gus Poyet at the Stadium of Light having been signed by the Uruguayan for Albion in 2010.
He began his career with Chelsea, spending three years with the Blues and took in loan spells with Yeovil Town, Watford and Stockport before joining Poyet on the south coast, where he made over 150 appearances.
He made his Scotland international debut against Serbia in March 2013.
Bridcutt becomes the Black Cats' fifth signing this month with Spaniard Marcos Alonso and Argentinians Oscar Ustari, Santiago Vergini and Ignacio Scocco having already been drafted in despite De Fanti's departure.
Poyet said: "Liam has got one advantage compared with the rest of the squad:
he knows us very well, he knows how we play, he understands the role perfectly, so the only thing that can go badly for Liam is if he is in bad form.
"The rest, I am so relaxed, I have got no problems. If I go with Liam in the
team, I am going to be very relaxed because I know what he's going to do.
"Then, of course, he can have a bad day like any other player, but he knows
the role, he knows what we want - he does it constantly and that's why he is
"If you take into consideration as well the price we paid for him, how much we
want him, how much we value him - he's British, he's young and for this
important role - I think it was a bargain for us to have.
"He is registered in time, it's done already and he is in the squad for
Saturday. I have got an idea and it could be a big possibility that he plays
Meanwhile, Mo Diakite has completed his move to Serie A side Fiorentina on loan till the end of the season.
The Frenchman moved to the Stadium of Light on a free transfer from Lazio over the summer but made just eight appearances for Sunderland this season.