But captain Vlaar is set to return from a calf injury which has provided some much-needed relief for Tim Sherwood's side.
Vlaar said: "I hope to be involved at the weekend. It was really frustrating to have another setback and that's happened a few times.
"But I feel good now and that's most the most important thing for me. A run of games is what I'm aiming for now - for myself and for the team. It's been really hard.
"Injuries have happened to me a few times this season and the feeling I have now is I'm as happy as a child.
"I played a few games but then got injured again. But hopefully we've found the cause and it feels a lot better now - more free with my calf.
"The knee injury was unfortunately something which would have happened one way or another but the calf kept coming back. It's all good now."
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