For the past two matches, Town have held a one-goal lead going into injury time but have had to settle for a point after conceding a late equaliser.
Barry Corr cancelled out Francois Zoko’s opener in the 89th minute to rescue Cambridge United a point on Tuesday night, and Mugabi knows what the squad need to look at going into Saturday’s trip to Cheltenham Town.
“We need to stay focused in future games,” he told YTFC’s official YouTube channel.
“It was a good performance and we controlled the game pretty well, but the last 10 minutes have killed us in both games (Orient and Cambridge) so that’s something we need work on.”
He added: “I guess it’s just a lack of concentration and focus. If we get that then I’m sure we’ll get the goals we need.
“All the boys are very disappointed with the result but we just have to pick our heads up and go again Saturday.
“We’re going to go there and try and get all three points that we deserved (against Cambridge).”