The Cottagers have been much improved since their disastrous start to the campaign but continue to find results hard to come by.
Parker – who after defeat to Leicester is bracing for the visit of in-form West Ham – has hailed the work of his players behind the scenes but says it may not all click in time, with the gap to safety having stretched to eight points.
Parker said: “They are working tirelessly to try and improve as players and individuals and as a team we’re trying to do that as well.
“At times it is fair to say we’ve fallen a little bit short but with that work ethic, desire and commitment I know that over time that will get better.
“That time may run out for us this year, that is a fact. As a team and a group of players we are heading in the right direction and we need to maintain that.
“There are 17 games left and there is no chance we are done and dusted.”
Deadline day signing Josh Maja trained for the first time yesterday and is expected to be in the squad tomorrow.