Stephen McManus' move from Celtic to Middlesbrough has been finalised, with a fee of £1.5m being agreed between the clubs for the Scotland defender.The 27-year-old has signed a three-year deal with the Championship club after passing a medical on Monday evening.
He had spent the latter part of last season on loan at the Riverside.
McManus could be joined at Boro by Rangers midfielder Kevin Thomson, with the English club admitting an interest in the Scotland international.
Boro said they were "not as far down the line" in concluding a deal for the 25-year-old who cost Rangers £2m from Hibernian in 2007.
Thomson signed a four-year contract and was a regular in Rangers' midfield as they retained the Scottish Premier League title last season.
We'll keep trying to add and add
Middlesborough manager Gordon Strachan
But the Scottish champions are heavily in debt and manager Walter Smith, who last week revealed Boro's approach for Thomson, has admitted that the Glasgow club would have to listen to offers for their top players.
Strachan this week said he was "nowhere near" finished his dealings in the summer transfer market despite having already secured Scotland striker Kris Boyd from Rangers, midfielder Nicky Bailey from Charlton and winger Andrew Halliday from Livingston.
"We'll keep trying to add and add," he said. "I hope we can make a right few signings over the next few weeks of different types.
"Some will be transfers and some will be loans, I imagine. "But transfers take a long time and a lot of hard work. We set the ball rolling with Kris and Nicky done this early, but fair play to the chairman and Keith Lamb, they've got two of our main targets nice and early and it's been hard work."
Strachan insisted that he would not be extravagant with the club's transfer money.
"There's not much money going around and quite rightly so," he said. "A lot of teams have had a real scare in the last five or six years and people should take note and we're taking note.
"There's not too much money about at present, at Middlesbrough or any of the Football League clubs. If you've got money, you have to use it wisely and I think we've done that."
McManus, who was entering the final year of his contract, was a regular in Boro manager Strachan's first team when he was Celtic boss.
However, the product of the SPL club's youth structure did not figure in new Celtic manager Tony Mowbray's plans and was farmed out to Middlesbrough in January.
McManus, who had been Celtic captain, made 16 appearances for Boro as they missed out on promotion to the Premier League in England.
However, although Mowbray lost his job in March and his successor, Neil Lennon, has said he would like to see McManus back at Celtic, he has now made the switch permanent.
Celtic have been in talks with former England defender Sol Campbell and are waiting on the 35-year-old, who has also been offered a new contract by Arsenal, to decide his future.
The Glasgow club have already signed versatile defender Charlie Mulgrew, who was out of contract with Aberdeen, and South Korea right-back Cha Du-Ri.
Source: BBC Sport
Source: BBC Sport