Matteo Politano and Leonardo Spinazzola have returned to their respective clubs after the swap failed, but Inter and Roma are reportedly furious at each other.
The players had both undergone medicals this week and were meant to exchange places on loan with obligation to buy at the end of the season, as they were valued at €25m.
However, Inter seemed to pull the plug when they demanded extra fitness tests on top of the traditional medical for Spinazzola.
Then they asked to change the terms of the deal, making it a loan with option to buy, to be activated after 15 competitive appearances.
The clubs ended up discussing what constituted an appearance, Inter demanding it meant at least 45 minutes on the pitch.
At this stage, talks broke down completely and both clubs walked away from the deal.
Spinazzola already returned to Rome this afternoon, while Politano is flying back to Milan this evening, neither of them particularly eager to talk about the situation.
According to Sky Sport Italia, there is a great deal of tension now between the two clubs and it could affect any future deals on the transfer market.
Roma are pinning all the blame on Inter for trying to change the terms, while the Nerazzurri are said to be worried Spinazzola was handed over knowing full well he was prone to injuries.