The midfielder left Aston Villa for Newcastle United in the final days of the summer market.
However, Moyes admits Everton were also keen, though Ramsey chose the Magpies.
He revealed: “He chose not to come.
“He was one of that group and if you look at their subs (for last week's defeat) – Sandro Tonali didn’t start for them. They have a really strong team and beating Manchester City gives you an idea of where they are at.”
On buying in January, Moyes added: “I’d be hoping we would be looking to do some business if we can. January is never a great window when trying to get the right value and the right players who you might want, but I think if we could add to it we certainly will.
“We didn’t do it last January – we just had Charly Alcaraz come in on loan. We might be looking at the loan market again and seeing what we need.
“Certainly, the people who do the job are working behind the scenes to see what might be possible.”