Swansea midfielder Jonjo Shelvey apologised to City supporters after his mistakes set up both Liverpool goals in the
2-2 draw at the Liberty Stadium.
Shelvey put the Swans ahead against his former club, before his slack backpass allowed Daniel Sturridge to equalise.
Victor Moses put the Reds ahead after a sloppy pass by Shelvey, who made amends by setting up Michu's leveller.
Jonjo Shelvey factfile
- Born: 27 February 1992
- Played for Arsenal and West Ham at junior level before moving to Charlton in 2007
- Made his first-team debut aged 16 years and 59 days in April 2008
- Joined Liverpool in May 2010 for an initial fee of £1.7m
- Scored six goals in 10 games during a two-month loan spell at Championship side Blackpool in late 2011
- Recalled by Liverpool and went on to make 32 Premier League appearances in 2011-12 and 2012-13.
"I just want to say sorry to the fans for the two bad mistakes that gifted Liverpool a draw," said Shelvey, 21.
"You just want to go into a hole where nobody can see you when you give the ball away for the other team to score, but it has happened to great players over time."
The England international was making his first appearance against Liverpool since
leaving Anfield in a £5m summer move.
He showed composure to curl in Swansea's opener after 87 seconds, before his lack of concentration allowed Liverpool to level less than two minutes later.
The visitors led before half-time when another wayward pass from Shelvey was seized upon by
Reds debutant Moses.
But the former Charlton man partially redeemed himself by flicking on a Leon Britton pass for Michu to steer in a second-half equaliser.
"I showed a bit of character to keep getting on the ball," added Shelvey. "I still feel I have given Liverpool a draw but it was a great game to play in."
Both Swansea manager Michael Laudrup and Liverpool counterpart Brendan Rodgers have backed Shelvey to learn from the experience.
Swansea's Jonjo Shelvey was also booked after clashing with ex-Liverpool team-mate Lucas Leiva
"When you do that you go from heaven to hell in just a couple of minutes, scoring a goal in a very important game for you after two minutes but then you give away a goal - and another one with a ball lost," said Laudrup.
"I told him [at half-time] 'there are still 45 minutes, you have to learn from this and pull yourself together', and I think he did great.
"He will become stronger out of this, his reaction in the second half was excellent."
Reds boss Rodgers added: "Jonjo Shelvey is an outstanding young player, but he knows he has things in his game he needs to improve on.
"He will only do that from playing. This was a steep learning curve for him."