Rumours. I'm entirely against selling Diego, even if he is used in a straight swap for Dzeko.
A RW and a LB are far more of a priority than a Striker at this point in time. If we don't have the money, then we can simply wait until next season and focus all our efforts on a striker, depending on whether we will be competing in the CL or not. As for this season, with us in the EL and with Serie A in constant decline, I don't see a need to splash money on Dzeko.