Mohun Bagan finished their I-League engagements with 47 points while Pune had to settle for 46.
Barreto was leading the side with perfection right from the start as he gave a brilliant sixth minute goal, while the current Mohun Bagan heart-throb and Nigerian goal machine Odafa Okolie completed the tally with an 89th minute goal to make it really memorable.
The 30,000-odd crowd gave a standing ovation to Barreto as he was adjudged man-of-the-match in his last appearance for Mohun Bagan.
The Brazilian's spectacular left-foot finish from a Hudson Lima pass from the left flank was enough to get past a diving Pune FC goalkeeper Subrata Pal on his left, something that brought the lively crowd on to their feet.
The Brazilian was all charged up as the crowd chanted 'Barreto, Barreto' as he led the side in his swansong match for Mohun Bagan. He even argued with the referee Santosh Kumar from Kerala to get across his point to entertain the crowd.
Apart from occasional sparks from the visitors, Mohun Bagan dominated the proceedings.
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In fact, they could have easily scored at least a couple of more goals but Pune FC defence stood out with two brilliant goalline saves.
Karma Tsewang thwarted a fine attempt by Sunil Chhetri four minutes after Barreto's strike.
In the 54th minute Anas Edathodika made another goalline save from a combined effort by Barreto and Odafa Okolie. MORE