The 22-year-old has himself indicated his preference to stay at Valencia next season, while his contract expires next summer, meaning that Chelsea will only get a fee if they sell this time around.
On all counts, then, a move seems to make sense.
Romeu made 14 appearances for Valencia last term and stands a much stronger chance of getting into the Spanish side than at Stamford Bridge.
At Chelsea, he would have faced competition from Ramires, Nemanja Matic, John Obi Mikel and Marco van Ginkel. But, now that Cesc Fabregas has been added to the equation, Romeu can count himself well and truly out of the first-team picture.
At 22, the Spaniard may have a bright future ahead of him, so a loan move could have made sense - just as it seemed to with Romelu Lukaku and Thibaut Courtois last term.
But a short-term switch this time around simply isn't feasible considering the fact that Romeu's contract expires at the end of the upcoming season.
The only other alternative, then, would be a place in Jose Mourinho's squad. How viable is that alternative, though, when the likes of Mikel and Ramires - with 54 Premier League appearances between them last season - are having questions asked of their futures in West London?
As many games as Chelsea will face next season, in Europe, the league and the cups, there are only so many to go around. And however talented Romeu may be, he simply hasn't made enough of an impact to guarantee him playing time at Stamford Bridge.
If a permanent move to Valencia beckons, all parties would be wise to thrash out a deal.