The lightning quick front man pulled in a fine performance to match the
McLean, who has 16 league goals to his name, scored with just four minutes on the clock to mark an emphatic performance.
He will feel unlucky not to have addded a second to his tally after striking the woodwork later in the game.
Colchester United writer Jon Waldron admits he was impressed with his contribution throughout.
"He had a great start by scoring and he went on to have a good game'" he explained.
"He looked lively right until the end. He looked extremely dangerous.
"He definately looks like he could play at a higher level - he seems to be one of the hottest young talents around and Peterborough seem to be teaching well with his non-league background," said the U's reporter.
McLean continues to impress in the basement legaue but will be relishing his chance to shine on a higher stage again as Posh face either Charlton or West Brom in the fourth round of the FA Cup.