Leyton Orient boss Russell Slade bemoaned the decision to rule out Scott Wagstaff's strike as his side lost 2-0 to Colchester.
Goals from Anthony Wordsworth and Ian Henderson either side of half-time put the visitors in control before Wagstaff's 75th minute effort was ruled out by an offside flag.
The same player forced a fine save from Colchester keeper Mark Cousins a minute later and Slade was left to ponder the missed opportunities.
Slade said: "I thought that we created the best three chances of the evening - Ryan Brunt in the first period, the Wagstaff opportunity that was taken away from us because of offside even though it was a goal, and then Dave Mooney should have buried the header towards the end.
"We've had a goal chalked off and that makes life difficult.
"We've had a couple of bad decisions in the last two games and one or two things are not quite going our way right now. It's a concern that we are not scoring goals but we should have had one."