Swansea City manager Carlos Carvalhal said he received an apology from officials who allowed Tottenham's first goal to stand in their 2-0 defeat on Tuesday.
Former Swans striker Fernando Llorente struck a controversial 12th-minute goal - television pictures clearly showed Llorente standing in an offside position when he met Christian Eriksen's free-kick.
But Carvalhal - whose side remain bottom and four points from safety - said assistant referee Marc Perry had owned up to his mistake.
Bottom-placed Swansea could also take issue with referee Bobby Madley's decision to allow Davinson Sanchez to stay on the field after 55 minutes. Sanchez, already been booked for an off-the-ball incident in the first half, scythed down Martin Olsson and seemed certain to be sent off.
But Madley chose only to lecture Sanchez before Spurs boss Mauricio Pochettino substituted the Colombian four minutes later, handing the fit-again Victor Wanyama his first run-out since August.