The 31-year-old West Ham centre-back has been linked with Norwich.
Now, looking at West Ham's official squad, beyond Winston Reid, James Tomkins and Angelo Ogbonna, Collins offers the east London side their only back-up at centre-back.
That is with the exceptions of Reeces Burke and Oxford, of course. But both are still very young indeed and, should one of West Ham's first-choice centre-backs get injured, are they really ready to fill in long term?
At such early stages in their career, they could do without the pressure - which means a Collins sale would likely see the Hammers re-enter the market for a replacement.
And, considering the terrible job the hierarchy have so far done in their search for both a new striker and midfielder (there is talk of an Alex Song deal in place but we are all still waiting), would that simply be creating an extra problem for West Ham so late in the transfer window?
Of course, if Collins isn't going to play anyway and can recoup some money instead of leaving next summer for free, the sale could well be acceptable on both fronts. But if West Ham aren't going to replace the 31-year-old - or do it badly - the Welshman could be best kept until at least January.