Celtic claim a fee was agreed with Manchester City for John Guidetti prior to them taking the striker on loan.
Xabi Alonso claims no Premier League offers were put to him before leaving Real Madrid for Bayern Munich.
Ba has been on top form for the Magpies this season, scoring 11 goals to add to the 16 he bagged last term.
Toon boss Alan Pardew admitted on Thursday that Ba would be sold if he did not remove the £7.5million release clause in his contract.
Arsenal are one of a number of clubs who have been linked with the 27-year-old, but even though Wenger admits he is a good striker, the Frenchman insists he has no plans to sign the player.
"I like Demba Ba, yes," the Arsenal manager said ahead of his team's match against Newcastle tomorrow.
"I don't think [this] is the right place to speak about that, because he plays against us tomorrow.
"I wouldn't like to put Newcastle or us or him in an uncomfortable position. If you ask me 'do we sign Demba Ba?' I say no."