Viduka has made only two appearances, both as a substitute, since starting his last game in the FA Cup at Stoke on January 6, and it is no coincidence they have struggled badly for goals in his absence.
Viduka's last significant contribution came as he scored a face-saving double to secure a 2-2 draw against basement boys Derby two days before Christmas, and Keegan is desperate for the 32-year-old Australia international to add to his tally of five for the campaign as the stakes mount.
"When you have got a small squad, like we have, one player coming back makes a big difference, and especially a forward as we haven't been scoring enough goals," said Keegan.
"He brings with him a goal threat different to any other player we have got at this football club.
"He can score goals in tight areas and he can hold the ball up well. He is very, very experienced.
"He is on the road back, and at this moment in time, provided we don't get any setbacks, will be available for selection on Monday night."
A combination of calf and hamstring problems has made for a frustrating few weeks for the former Middlesbrough frontman, who has managed just 13 starts to date and a further seven as a substitute during his first season on Tyneside.
Keegan said: "He knows what it takes to score goals in the Premier League because that is what he has done consistently over the years.
"I am just delighted to have him back. We nearly got him there about four weeks ago, but when he got to the crucial stage, he started to have minor problems.
"They are all behind him now, I think. He is ready to now play a part in what is a nine-game season for us."
