Neill, who also held talks with Atletico Madrid of Spain and was linked with a move to Turkey's Galatasaray, is the fourth permanent addition to boss David Moyes' squad, following Sylvain Distin, Diniyar Bilyaletdinov and John Heitinga to Goodison Park.
He goes straight into Boro's boss Gordon Strachan's squad to face former club Sheffield United on Saturday.
But that plan was scuppered and instead Fulham boss Roy Hodgson and his squad travelled by luxury coach to Folkestone on Tuesday.
The City boss is pleased to have his squad settled in time for the final pre-season warm-up match against Evesham United at St George's Lane on Saturday.
And Smith, who led Rangers to nine successive league titles in his first spell as Ibrox boss, admits that his current squad face a challenging task to finish the season as league leaders.
Bojinov, who has signed subject to being granted a work permit, is the latest foreign import to new boss Sven-Goran Eriksson's squad.
The Fir Park boss is determined to add to his squad ahead of the new campaign and is confident he can attract a couple of new players to the club in the coming weeks.
The Hibs boss signalled efforts will continue to strengthen his squad by Monday evening's close of the January transfer window.
But Manchester City boss Mark Hughes - with a more gifted squad at his disposal - was arguably under greater pressure to win.
Midfielder Craig Conway said the United squad were behind Houston and wanted him to become their new boss.
BBC: Peter Houston is Dundee United manager until the summer
The 20-year-old Dutch striker has agreed a five-year contract as Liverpool boss Rafael Benitez continues a major overhaul of his squad.
Sittingbourne had been angered in the build-up to this first qualifying round local derby by Dartford boss Tony Burman's decision to rotate his squad.
And Beckham's England career is also in the balance after new national boss Steve McClaren left him out of his first squad for Wednesday's friendly.
BBC: SPORT | Football | Europe | Beckham late for Madrid training
Saints boss Gordon Strachan was left with five first-team squad players on Tuesday and Wednesday to prepare for Saturday's FA Cup match with Norwich.
The squad also includes Ulster players Neil Best, Rory Best, Isaac Boss, Ryan Caldwell, Tom Court, Stephen Ferris, Paddy Wallace, Roger Wilson and Bryan Young.
The U's were left with a heavily depleted squad following the departure of Quinn, but Rolls says the former boss provided much of the basis for their current success.
But the new boss stressed he and his backroom staff would not overhaul the squad.
The news will also be a blow to Wales boss Gary Speed as Ricketts was expected to be in the squad to face England on 26 March in the Euro 2012 qualifier in Cardiff.
Blues boss David Jeffrey is delighted to have Allen in his Windsor Park squad.
Middlesbrough boss Gareth Southgate had been keen to keep the nucleus of his squad together, following their relegation from the Premier League in May.
The Ibrox boss would like to add a defender and a striker to his squad, the latter to compensate for the loss of their top scorer to the Turks.
BBC: Rangers manager Walter Smith looks to bring in loan duo
England boss Martin Johnson revealed Wood was told he was playing at the squad's training camp in Portugal last week and that one of his back-row rivals, Fourie, was not considered because he was only able to resume training this week.
BBC: Six Nations: Tindall leads England as Wood handed debut
Prop Mike Ross, Isaac Boss and Fergus McFadden joined Damien Varley in being added to the Ireland squad and they will be in contention for the replacement slots to be announced on Thursday.
City created nothing in the second half, apart from a Rolando Bianchi shot from distance, and again showed why boss Sven-Goran Eriksson remains desperate to add another striker to his squad during the January transfer window.
However, Bryan Young and scrum-half Isaac Boss have been omitted and are likely to feature in the Ireland A squad while Stephen Ferris and Simon Best, along with Paul O'Connell were not considered due to injury.
Although Wasps insist that Vickery is "recovering well" from the surgery, the fact that he cannot start training for a minimum of eight weeks makes him highly unlikely to be part of England boss Martin Johnson's thinking when he names his new Elite Player Squad for the tournament on 13 January.
"We need a squad of 22 players to compete, Mark is a welcome addition, " said Cardiff boss Peter Ridsdale.
Nevertheless, boss Darren Ferguson has handed Lewis his backing and Zakuani says the whole Posh squad are fully behind their under-fire shot-stopper.
Australia coach Pim Verbeek blamed Rhys Williams' club boss after the young defender missed out on his final 23-man World Cup squad.
CNN: Lee wins South Korea World Cup spot despite injury problems
The Bolton boss also played up Cahill's chances of making Fabio Capello's England squad for the World Cup in South Africa this summer.
BBC: Gary Cahill could return for Bolton in four weeks' time
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