Eric Berry: Kansas City Chiefs safety has what is believed to be lymphoma found on his chest

Berry, 25, going for further testing in Atlanta, Georgia

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Kansas City Chiefs safety Eric Berry is to undergo further testing after having a mass - believed to lymphoma, a form of cancer - found on his chest.

The 25-year-old will not play again this season and will head to Emory University Hospital in Atlanta, Georgia.

Chiefs trainer Rick Burkholder said there is not a "definite diagnosis" just yet.

"At this point in time, we don't have a definitive diagnosis," he said at a news conference on Monday afternoon. "But the leading consideration for what he has right now is lymphoma.

"We first were alerted to something on Thursday night. It's now Monday. We still don't have a definitive answer. That's OK. We'll get to the experts and we'll get the answer. We'll get a treatment program and we'll go from there."

Berry complained of discomfort in his chest following the defeat to the Oakland Raiders on Thursday night. He was examined by the team but continued to experience discomfort on Friday, before an MRI scan revealed the mass.

Players undergo regular checks, including X-rays and blood work, but Berry never had a complaint until after the game, said Burkholder.

Berry, the fifth overall pick of the 2010 draft, issued a statement saying he is "in shock" but promising to return.

"I am truly thankful for all of the support from family, friends, coaches, teammates and the entire Chiefs kingdom," said the three-time Pro Bowler in the statement. "At first I was in shock with the diagnosis on Saturday and did not even want to miss a game, but I understand that right now I have to concentrate on a new opponent.

"I have great confidence in the doctors and the plan they are going to put in place for me to win this fight. I believe that I am in God's hands and I have great peace in that.

"I know my coaches and teammates will hold things down here the rest of the season and until I am back running out of the tunnel at Arrowhead. I am so thankful and appreciative of being a part of this franchise and playing in front of the best fans in the NFL. I will be back!"