Centre-half McCaffrey continues to recover from a persistent foot injury, while left-back Forsyth's hamstring problem has yet to abate fully.
And Ton boss Moore has already begun to identify possible new recruits, taking in Hibernian's home match with St Johnstone as his side took on Celtic in a bounce game this week.
Moore told the Tele: "I went to watch the Hibs game with St Johnstone and obviously with the transfer window opening up in January I'm just doing what any other manager is doing.
"I'm just going to look about to see what is available. I don't know who could be available next month but I'm looking about to see what there is.
"We've still got a concern over Stuart McCaffrey so that's a position we might have to try and fill and get a bit of cover.
"Unfortunately it doesn't look like he is going to be back any time soon and if we have another injury then we would be short in central defence.
"So we are looking about to see what players might be available next month. There might not be any finance available, but we've got to go and look.
"Ross is in the same boat as Stuart McCaffrey and his injury looks a bit more long-term than we'd like.
"We knew if we lost him then we would be a wee bit light in that area of the pitch and a lot of teams don't have cover at left-back.
"So that is a wee worry. We had the Finnish boy in but there could be complications with bringing him back over as he is still attached to FC Twente.
"We have a wee bit of work to do in the transfer window, but we will just have to wait and see who's available and if we can bring somebody in."
Moore will also have a decision to make regarding the futures of Derek Young and Kevin McCann, whose short-term deals end next month.
But while the Cappielow gaffer declined to comment on that pair, he did confirm that on-loan goalkeeper Dominic Cervi would return to Celtic next month.
He said: "Dominic will go back to Celtic. He only came in on a short-term loan as big Colin Stewart did his hamstring and Matt McGinley broke his hand.
"Dom knows he is going back to Celtic and I've spoken to Colin and he is confident that his hamstring will be fit by then.
"Hopefully the wee rest that big Colin has had will give him the appetite that goalkeepers need at times to come back stronger.
"Both he and wee Matt will be fighting it out for the first-team jersey. It was a worry at the time when they were out, but Colin is champing at the bit to get back in, which is good to see."