If Peterborough beat Middlesbrough on Saturday afternoon, Ipswich would start the late game at Cardiff City Stadium propping up the division.
Although the Tractor Boys are unbeaten in six games since October 3, five of those have resulted in draws, with the victory over Derby their sole success of the season.
However, Cardiff have taken just one point from a possible nine following a run of four wins and two draws which catapulted the south Wales side into promotion contention.
Jones told Cardiff's official website: "Roy has gone in there and is doing a good job. Sometimes when results don't go right there is speculation.
"But they've got good players, he's brought some good players in and he is probably trying to mould them into the team he wants and that doesn't happen straight away.
"They've picked up some good results, they've had some near misses of just turning draws into wins and we know it will be a really hard battle. They beat us last year so we know it's not going to be easy.
"It's another tough game for us. We need everybody up and running and everybody getting back to playing the way we know we are capable of."