Terry's mother and mother-in-law were named in newspapers regarding shoplifting allegations but Terry, who should win his 50th cap for England, said the reports would not affect his preparations for the match.
"At the age I am now, I've got experience of seeing many headlines and as a player you get on with it," he told a news conference at the Arsenal training ground on Friday.
"It's a family issue that the solicitors are dealing with and I will fully concentrate on football, like I did in training this morning - it doesn't affect myself or the other players, and I am fully focused on tomorrow's match."
Police said two women aged 50 and 54 had been cautioned for shoplifting but declined to confirm their names.
Terry said that despite last month's defeat to European champions Spain, and the failure to qualify for last year's European championship in Austria and Switzerland, the England team were becoming feared again.
"After the disappointment of missing the Euros, no-one was hit harder than me," he said.
"But we are more determined than ever to do well. We have had a great start in the qualifiers and are just looking to keep winning and winning. Other teams are fearing us again and we are hoping we can use that to our advantage."
He said Saturday's friendly was an important rehearsal before next Wednesday's Group Six World Cup qualifier against Ukraine at Wembley.
"They (Slovakia) are a big test. They play similar to Ukraine, they are going well and are at the top of their group and have some good players in their side.
"If we can get the right result that will be fantastic but the main thing is that everyone stays fit and comes out of the game unscathed."
