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Governing body the UCI introduced the ban in 2011, but a whistleblower said Team Sky continued to inject riders.
One of the substances said to have been injected is Fluimucil, at the heart of the controversy over a mystery package delivered to Bradley Wiggins in 2011.
Team Sky had been renowned for their robust no-needle stance.
In March, British cyclist Josh Edmondson told the BBC he broke the sport's rules by secretly injecting himself with a cocktail of vitamins when riding for Team Sky.
The substances are not illegal under World Anti-Doping Agency (Wada) rules but there are concerns about the ethics of administering them intravenously.
Ukad and the UCU are investigating claims by Edmondson that Team Sky covered up his use of banned injections.
Team Sky deny doing so, insisting that Edmondson did not confess at the time, and that they did not report the case because of concerns about his mental wellbeing.
PA's source, who sent the information to the House of Commons' Culture, Media and Sport Select Committee and Ukad, is understood to have worked for Team Sky.
The source said some Team Sky doctors were using intravenous recovery methods towards the end of the team's difficult first season in 2010 and continued to do so despite the UCI ban, which Team Sky publicly supported.
The source has claimed Team Sky hired Dr Fabio Bartalucci in late 2010 as he was believed to have expertise in IV recovery.
The Italian, who was picked up by police in an anti-doping raid at the 2001 Giro d'Italia but not charged, left in 2011.
Ukad said it "does not discuss or disclose information in relation to its investigations".
Culture, Media and Sport Select Committee chairman Damian Collins said: "This raises further concerns about how Team Sky policed the use of medication for riders outside of competition, and how hard they were prepared to press up against the line of what was allowed or acceptable."
BBC Sport attempted to contact Team Sky. However, a spokesperson earlier told PA: "It is right that any concerns are reported to and dealt with by the appropriate authorities, and we will continue to co-operate with them."

The 71-year-old was crushed under the vehicle as she crossed Princes Street opposite the Waverley Steps and beside the Balmoral Hotel on Thursday.
The crash happened at about 12:15 and the road was closed for two hours.
Sgt Iain Blain, of Police Scotland, said: "This collision has left a woman with serious injuries and we are keen to hear from anyone who witnessed it."

They were ahead against Elgin City after 19 minutes as Jonny Court shot from the right side of the area from a Lloyd Kinnaird pass.
Mark Nicolson was off target with a shot and Kyle MacLeod headed at Darren Dolan as Elgin tried to force a way back into the game after the interval.
But Alistair Roy's shot secured the victory with three minutes left.

Richard Walsh, 43, was accused of attacking the two schoolboys, aged 12 and 13, in Havant, last month.
He had been in custody at Belmarsh Prison in south-east London.
Prison staff found Mr Walsh unresponsive in his cell on Sunday morning and, despite efforts to revive him, he was pronounced dead.
A Prison Service spokeswoman said: "HMP Belmarsh prisoner Richard Walsh was found unresponsive in his cell on Sunday 19 July. Staff attempted CPR but paramedics pronounced him dead at 11.07am.
"As with all deaths in custody there will be an investigation by the independent Prisons and Probation Ombudsman."
Mr Walsh, who was also charged with assault and robbery in relating to the taking of a bicycle, had been due to appear at Portsmouth Crown Court on Monday.
The UK Anti-Doping Agency (Ukad) is investigating claims Team Sky may have breached cycling's 'no needles' policy, according to the Press Association.
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