The Premier League champions returned to form on Wednesday by beating Olympiacos to reach the quarter-finals of the Champions League, but Giggs admits that it is frustrating to see the team struggle to produce their best on a regular basis.
"Well, you can see why people are saying that because we haven't produced it this season on a regular basis," the 40-year-old told members of the press. "I know from experience what these players are capable of, but a lot of them have been written off.
"I think there is a lot of quality within the dressing room and we showed it against Olympiacos, but we have to show it more consistently.
"We are capable of it, so that's the disappointment. I see every day in training what the lads are capable of and they have not transferred that into the games and we need to do that."