Graham left for Wolves last week.
"We go with four strikers and they all want to play in the middle," Poyet said.
"It was a difficult situation for Danny to go into the team. You need something to happen - a cup game where you play and show something different, an injury, a sending-off, to have a chance.
"We didn't have enough time for Danny to have that opportunity, but he has been training very well and showing why he has been in the Barclays Premier League for a few years.
"The main thing here is to play and get back to a fully match-fit situation."
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