Tottenham Hotspur want a further £5m from Swansea City for their England Under-21 midfielder Tom Carroll, having already agreed a deal for the same price for the full-back Kyle Naughton.
The move for Naughton, 26, is expected to go through before the end of the week and represents some of the proceeds of Wilfried Bony's sale to Manchester City being reinvested.
Flush with the money from City, Swansea's scope to negotiate prices downwards has been limited.
Carroll, 22, has been on loan at Swansea since August and has played 15 times, 11 in the league. A key figure in Gareth Southgate's England Under-21 team, he is suited in the long term to the style of play that Garry Monk has continued to develop since he took over at Swansea, who yesterday suffered the blow of losing winger Wayne Routledge for four weeks with a calf strain.
Naughton is set to miss Tottenham's Capital One Cup semi-final against boyhood club Sheffield United tonight as a move to Swansea edges closer.
The full-back came through the ranks at Bramall Lane, making 50 appearances for the Blades before moving to north London in 2009.
Naughton arrived at White Hart Lane at the same time as Kyle Walker, although has struggled to make the same impact as the England right-back.
He is now understood to be closing in on a move to Swansea, with a fee, reported to be £5million, having been agreed with the south Wales club.
Spurs head coach Mauricio Pochettino was coy about Naughton's future yesterday. He said: "I can't tell you any news or any comment," but suggested that his exit would be the exception rather than the rule.
Paulinho, Aaron Lennon and Roberto Soldado are amongst those to be heavily linked with a move away, with the latter said to be interesting Bundesliga side Bayer Leverkusen.
Soldado has struggled for goals and form since arriving for £26million in the summer of 2013, although Pochettino insists he has no intention of selling the misfiring striker, nor anyone else.
"I am happy with him," he said. "I am the same as before. All players are in my plans and (there is not) any news.
"I expect all players to be here because we have a lot of games.
"We are still in four competitions and I think that we need a strong squad to take on all games that we have in the future."
Pushed to confirm Soldado was not for sale, Pochettino retorted: "Any player is not for sale. Any player. We want to keep all players because we need all players, a strong squad.
"I am happy with the squad."
The transfer talk somewhat distracted from what was supposed to be a press conference previewing tonight's clash against United.
The third-tier Blades approach the match as underdogs, but should not be taken lightly given they have beaten five Premier League side since the start of 2014.
"We know that Sheffield are a very good team," Pochettino said.
"In this type of competition, it is not important whether you play in Premier League or League One.
"When it is decided over one or two games, it is important to be focused and we need to show respect for Sheffield United.
"When we watched their game against Southampton and against QPR, they deserved to go through.
"They played very well - they were the more aggressive and physical team. I think we need to be focused on our game and play with intensity, high level and high tempo."
Capital One Cup: White Hart Lane, Tottenham Hotspur v Sheffield United 7.45 pm (Sky Sports 1)