Mackail-Smith came on with three minutes left of the 2-0 defeat at the Emirates Stadium to cap a frenetic week for the League One player of the year.
He said: "The manager told me to go on and enjoy myself and that is what I did, though it`s a shame I didn`t get a touch of the ball really!
"I closed down Dani Alves and got a nick on it so I am counting that.
"The last week has been crazy but it is what I have worked so hard for throughout my career.
"I am just going to concentrate on scoring goals now and maybe I will get another chance in the future."
Source: PA
Source: PA