The Welsh midfielder has been suffering from a shin complaint and missed this week's defeat at Middlesbrough.
Acting boss David Pleat said: "We've had good news on Simon - he's going to start training again on Monday.
"When we played at Charlton and won 4-2 I thought that was a team that could go on.
"Simon had a very good game, probably needed two or three games to get going again after being out for a long time but had a setback after the Welsh game.
"But he was smiling again this morning."
Simon Davies has been given the go-ahead to start training again on Monday.