WREXHAM hope to have striker Juan Ugarte and defender Steve Roberts back in action on Saturday in the aftermath of the viral infection which swept through the club last week.
Although fellow-sufferers Craig Morgan and Chris Llewellyn had recovered enough to be involved in Tuesday's 2-2 draw with Colchester United, manager Denis Smith said the bug had taken its toll.
But he added that nothing could excuse the lacklustre performance against Phil Parkinson's team, describing it as a shambles and admitting that Wrexham were lucky to take a point from the game.
"I've got to be honest - I was extremely angry after the game and a few words have been said because we need to start winning matches," said the Dragons boss, whose side entertain MK Dons on Saturday.
"While Colchester have a great record away from home and are a good side, having played so badly in the first half and then to be gifted the lead, we shouldn't have let it slip.
"That wasn't us and we were awful. "With the exception of Mark Jones, the rest of the performances were a shambles and after the way we've been playing of late it was extremely disappointing.
"We were very fortunate to get something out of the game."
Wales under-21 midfielder Jones, who gave Wrexham the lead against the run of play with a weak shot that slid under goal-keeper Dean Gerken, and substitute Hector Sam, who popped up with the 80th-minute equaliser, were the only two players to escape the manager's criticism.
"There were a lot of players who were below par and fair play to Colchester they came and played to a system and man-marked certain players," he added..
"But when we were gifted the lead, we should have done better.
"I was delighted with Mark Jones because if you don't shoot you don't score and he had two or three good efforts before the goal. He was the only one shooting.
"Carlos (Edwards) got in some great positions but didn't look as if he was interested, we never got anything down the left and, until Hector came on, didn't look as if we were going to get a goal from the front."
In mitigation, Smith said last week's illness had severely disrupted preparations for both Tuesday's match and last weekend's trip to Hull City, where the home side won 2-1.
"We got done by a set play on Saturday and another two against Col-chester. That's down to poor organisation and things you do in training," he said.
"It's frustrating because it's easy enough to work on and these mistakes are easily rectified if I've got the players around to work on things. But Alex Smith was passed fit just before the game and Chris Llewellyn perhaps should not have played.
"With all the games we've been playing and with such a small squad, it's putting a lot of pressure on the lads, but I don't believe they all earned their money against Colchester.
"I've been very pleased with them of late but I was not at all happy after a game when we should have done a lot better."
Wrexham find themselves seven points adrift of League One safety with 12 matches to play, but Smith said it was meaningless to set his players any targets. "We need enough wins to stay up, there are 36 points to play for and that's enough," he added. "If we win all our games I can guarantee we'll stay up and that's the attitude we've got to have between now and the end of the season.
"Injury-wise we won't have many players back on Saturday, but illness-wise it's a bit better. Juan was here for the game, Morgan has had a game and Steve Roberts has done a bit of training.
"Hopefully by Thursday when the lads are back in we'll be able to work on set plays and improve things on Saturday."
Wrexham's reserve team match at Rochdale yesterday was postponed because of a frostbound pitch.