Pipa is out for Wednesday's Championship visit of Barnsley, Toffolo, Isaac Mbenza and Yaya Sanogo are doubts and Alex Vallejo and Fraizer Campbell have been ruled out for a fortnight.
Pipa started Saturday's important 2-0 win at Nottingham Forest but Isaac Mbenza was left out of the squad as the Terriers look to manage injuries caused by playing so many matches in a short period of time this season. Toffolo returned from a back injury at the City Ground, but coach Carlos Corberan is wary of asking too much too soon of the left-back.
The advice is clearer on Vallejo, still suffering the effects of concussion suffered at Easter, and Campbell, who went off with a shoulder injury at Forest.
“Vallejo continues to be about of the team,” confirmed Corberan. “On medical advice for the next two games he is going to be out of the team because he still cannot head the ball. He can train with the group without heading the ball but we need to keep him out of official games.
“He went to see a specialist and the specialist was calm but the medical advice – more than advice, the regulation is that he cannot play. We need to be patient.
“Toffolo is going to be a question mark, we need to see how he reacts (in training). It will be a risk to have him in the XI so we will follow the medical advice to see if he can play three days after the previous game or if he cannot. We know his injury came from the accumulation of games.
“Fraizer Campbell was one of the changes (on Saturday) and he is not going to be available because he has an injury in the shoulder. We cannot expect to have him before the Coventry game so he is going to be out for two weeks.
“On the other side, (Carel) Eiting has been involved in training so we will see how he reacts and if he can be available.”
On Pipa, the Spaniard said: “Since Sheffield Wednesday he's played all the games with pain. The fact he played many minutes during the international break has just increased the problem.
“From now until the end of the season he has to manage the situation and get the habit of playing with pain. He is preparing his body to play with a lower level of pain.
“The situation (Mbenza) has is similar to Pipa in the last month and a half. He is not 100 per cent and you need to decide if the best thing is to continue with him or to go with alternative players until he can be 100 per cent.”
If Sanogo is ready to return from a foot injury, he offers a natural alternative to Campbell, whilst Koroma was an unused substitute at the weekend, his first involvement in a matchday squad since December's hamstring tear.
“He is better,” said Corberan of targetman Sanogo. “We still have one more training session to do with him to see if he has options tomorrow or not. He's still a question mark but he's been training this week.
“When you have an injury you cannot think about the past, you just have to think about adapting. We have Danny Ward as one of our (fit) strikers and Josh Koroma at the beginning of the season could play there too.”
Saturday's win took Huddersfield to 47 points and put safety in sight, although three more are needed before they reach the Championship's usual accepted safety mark.
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