The winger could make this weekend's clash with Liverpool.
Clarke told the WBA website: "Any player when they're injured is frustrated.
"Scott had a season last season when he didn't play a lot.
"He was just starting to get his teeth into this season when he picked up this injury.
"It was quite a substantial injury and it's coming up to four weeks now, which is normal when the time-frame for a hamstring injury is four to eight weeks.
"He's a little bit frustrated, but I spoke to him this morning and he's still smiling, so he's not too depressed."
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