Fernando Tatis Jr. knows "there's no excuses" for a failed drugs that have seen the San Diego Padres shortstop's dreams turn into his "worst nightmares".

Tatis was this month given an 80-game suspension after testing positive for the performance-enhancing substance Clostebol.

The 23-year-old said he tested positive due to taking a skin medication that contained the steroid.

Tatis' ban ensured he will not play in the majors this season and he will also miss the first 32 games of the next campaign.

An All-Star last season after hitting .282 with an NL-leading 42 home runs and 97 RBIs, Tatis has decided to undergo shoulder surgery while serving a ban that he knows he can have no complaints over.

"There's no excuses," Tatis told reporters. "There's no excuses. I need to do a way better job on what is going inside my body. There's no excuse for these actions."

He added: "I have seen how my dreams have turned into my worst nightmares. 

"There's no other one to blame than myself. I haven't made the right decisions these past few weeks, month, even starting at the beginning of the year.

"I have made a mistake, and I regret every single step I have taken in these days. But there's a long way going forward. There's a very long way going forward.

"I'm gonna remember how this feels, and I'm gonna make myself not ever be in this position ever again. I know I have a lot of love that I have to gain back. I have a lot of work to do."

Padres president of baseball operations A.J. Preller says Tatis deserves a chance to make amends.

"Every relationship worth having – there's gonna be some great moments, there's gonna be some challenging moments," Preller said.

"I've talked to Fernando a lot about mistakes. We all make mistakes. I've made plenty of mistakes here as the general manager of this team, as I'm sure Padres fans will let me know from time to time.

"But the key is how you learn from those mistakes, how you grow from those mistakes, what you do going forward."