Anderson is available for loan this summer.
Williams told the Swindon Advertiser: "Both players we know and both players have qualities – to talk about them being close to signing would be wrong.
"They're certainly players that we know about and have taken some time to look at video of them and try to get a feel for what the players are like.
"We know Harry as a personality as well, he is somebody we respect. I think at the moment, it is speculation and nothing is close to being signed.
"We have looked at them and we have taken some interest. I think pursued in terms of negotiation is a bit wide of the mark but they're on our radar."