United currently sit in the bottom half of the table.
"Sir Alex was a great manager and a great influence on the team and the club," Giggs said. "You are always going to miss someone like that.
"But I don't' think that is an excuse when individuals aren't playing as well as they can.
"We are not playing well as a team, but we haven't got injury problems as we have had in the past, so there is no excuse."
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