John Stamos Tweets that He Is 'Back,' 'Grateful' Following Rehab Stint

John Stamos took to social media Friday to announce he is back after entering rehab last month.

“I’m back!” wrote the former Full House star. “Took a month to take care of things. Healthy. Feeling grateful for the love & support of family & friends.”

In the accompanying photo, Stamos wears boxing tape around his hands and swings one fist towards a punching bag hanging from the ceiling. The actor has a determined look in his eye and is wearing a sweat-soaked “Win Blackie Win” shirt, a nod to his General Hospital character.

PEOPLE confirmed on July 10 that Stamos had checked himself into a residential program for the treatment of substance abuse in late June.

The 51-year-old star was charged with a DUI on June 12, after which he was hospitalized briefly for an unknown medical condition.

Of the actor’s decision to enter rehab, a source close to Stamos told PEOPLE that he is “focusing on his health” and “knows he needs to take care of himself.”

Stamos is set to star in a highly anticipated Netflix reboot of Full House, titled Fuller House, a 13-episode series that will stream on Netflix next year.

The cast of Fuller House is already back at work, and costar Candace Cameron-Bure told Entertainment Tonight on July 16 that “everything’s great with the show. [Stamos] will be there.”