The Owls have run the rule over the duo in training. Ex-Huddersfield Town defender Simpson, 34, is now curently training with Bristol City, with the the full-back having previously worked with Robins chief Nigel Pearson at Leicester City.
Moore has stressed that Simpson was an option that the club decided not to pursue in any case.
Nothing is also in the pipeline regarding one-time Manchester United prodigy Morrison, 28, who counts Sheffield United and Middlesbrough among his former clubs.
Moore said: “There is no talk of both players. We have had both players in, but nothing has been definitely confirmed.
“Danny Simpson is a definite no. We just decided as a football club that he was not for us.
“Ravel has been out there in terms of a free transfer. We know about the boy’s ability and talent and everything else and it has just been an enquiry.
“Ravel has come on the radar, but nothing has been decided.
“It has been nothing but enquiries made on behalf of his representatives to the football club.
“At this stage, usually with free transfers, you don’t doubt their ability, but it is whether they are in a position to contribute on a physical element as the problem is that they have not trained a lot in a (competitive) environment and usually it takes time to get them up to speed."
Meanwhile, Moore says he will make an 11th-hour decision regarding the fitness of Sam Hutchinson after he came off injured in Wednesday’s game with Huddersfield - ahead of another Yorkshire derby at Barnsley tomorrow.
Izzy Brown and Andre Green are likely to be available, but Chey Dunkley is still sidelined.
Moore said: “We are assessing Sam and we will see how Sam is. He sustained a muscular injury and we will have him today and then just go from there, really.
“It will be an 11th-hour decision with him.”