With Gael Clichy also out, Armand Traore could deputise at left-back when Arsenal host Chelsea on Sunday.
Roberts has impressed hugely as an attacking left-back in Tranmere's run to the FA Cup quarter-finals.
Liverpool left-back Buchtmann, 17, has penned an 18-month deal and concludes the London club's mid-season activity.
O'Neill has now allowed him to join Fulham, whose first-choice left-back Paul Konchesky is injured.
Gareth McAuley is likely to be drafted into the defence with Jonny Evans switching to left-back.
But when fit Tierney has been Colchester's first choice left-back, featuring 79 times in two years.
Danny Collins, Danny Pugh and Andy Wilkinson are all possible candidates to replace Higginbotham at left-back.
Finland international left-back Kallio, 31, has already had one loan spell at Bramall Lane this season.
During qualifying he alternated between centre-back, left-back and the left-side of a three-man defence.
Left-back Thatcher played 90 minutes in the Manchester derby three days after Wales' game with Poland.
Dixon had returned to United's starting line-up, taking the place of Barry Douglas at left-back.
Rommedahl was the Addicks main threat and gave Fulham left-back Franck Queudrue a torrid first 45 minutes.
Aston Villa left-back Shorey, 27, and highly-rated 20-year-old Roma striker Okaka are on loan until the summer.
Esson was on hand again to stop Sammon's effort after the striker was found by left-back Gordon.
Alba, a left-back, could probably start in midfield for most teams and coolly swept home past Gianluigi Buffon.
Meanwhile Liverpool have completed the signing of French left-back Chris Mavinga, 18, from French outfit Paris St Germain.
Left-back Innocent Mdledle and left-side midfielder Franklin Cale were the other two players left out of the final squad.
Pompey had been linked with the left-back but he signed a new four-year deal at Stamford Bridge on Wednesday.
The left-back was poor, the centre-halves were way below par and I can't believe how poor Steven Gerrard was.
"It was important to get a win as we played at a high tempo, " said the Tottenham Hotspur left-back.
If you look at the Spurs first team, left-back would be a problem for me with Benoit Assou Ekotto.
Braga midfielder Alan caused young Reds left-back Danny Wilson all sorts of problems.
Left-back Tommy Williams is in contention for a place after his loan spell at QPR came to an end.
"This weekend I got a phone call from my father telling me that Celtic were interested, " the Netherlands left-back said.
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The 20-year-old received a second yellow card from referee Mike Dean for tripping Spurs left-back Benoit Assou-Ekotto after 75 minutes.
The London side's Swiss midfielder Kerim Frei was fouled by Swansea's left-back Ashley Richards as he burst into the area.
Although originally signed as a winger, N'Zogbia has been used both in midfield and at left-back by Newcastle this season.
Northampton chairman David Cardoza revealed his delight at securing the services of the former Nottingham Forest and Aston Villa left-back.
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In came left-back Nadir Belhadj for his first start, and winger John Utaka was included after shaking off a knee problem.
The defender joined United at the same time as left-back Patrice Evra and both have become integral members of the side.
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