SAN ANTONIO -

Photos have surfaced of Texas A&M Heisman winning quarterback Johnny Manziel reportedly at a Oklahoma casino over the weekend and also at a Dallas nightclub after the Aggies Cotton Bowl victory Friday night.

Manziel, 20, posted the casino picture of himself and his winnings on Twitter Saturday with the caption, "casino ballin." That prompted some criticism on social media even though he is over the age of 18.

TMZ then published more pictures of Manziel over the weekend at Avenu Lounge in Dallas. In one of the photos, he appears to be holding a bottle of champagne. None of the pictures showed Manziel consuming alcohol.

Manziel has been on a whirlwind media tour since winning the Heisman last month. He has also been spotted courtside at a Dallas Mavericks game.

In response to some of the social media backlash over the weekend, Manziel spoke to the press while in Florida and said he's still learning how to handle the notoriety, including what he should and shouldn't post on Twitter.

Manziel said he's still a small town guy and never could imagine the notoriety that came with winning the Heisman Trophy.

IMAGES: Manziel celebrates Cotton Bowl win

Published On: Jan 07 2013 04:18:19 AM CST

Photos published by TMZ of Johnny Manziel celebrating Friday's Cotton Bowl victory over Oklahoma.

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Photo published by TMZ