Left-back Haidara replaced Debuchy in the 13th minute before he was stretchered off prior to the half-hour mark because of a poor challenge from Callum McManaman and Pardew says the pair will now be assessed to see the extent of their problems.
"The doctor assessed him (Haidara) quickly before he was scuttled away to be assessed later," said the Newcastle manager.
"It looks like knee ligaments and bad bruising and that's the best we can hope for."
On Debuchy he added: "We will send him to France (for this week's international duty) for them to assess him but we think he will be on his way back.
"We don't think it is a particularly bad tear - a strain hopefully."