johnny manziel was spotted at a texas rangers game tuesday night just days after leaving rehab and was drinking water all night .
he entered a facility on january 28 and stayed for an extended period .
this after manziel 's partying had been a topic of conversation since his rookie season began last july , with some worried about his drinking .
he is now set to begin offseason workouts with the cleveland browns on monday .
manziel will be forced to compete with josh mccown for the starting quarterback position , who just signed a $ 14 million contract with the team .