The Manchester United captain was arrested and charged on the Greek island in a chaotic summer holiday.
England's centre-half is accused of assaulting a police officer and bribery but will go to a retrial in the near future to determine his verdict.
Maguire, 27, has appealed the guilty verdict and faces a new trial in Greece when he will attempt to clear his name.
He is back in the UK and now getting himself set for the start of the new Premier League season.
But prior to his arrest, Maguirespent time in the company of snooker star Trump - who was celebrating his 31st birthday on Mykonos.
The world No.1 was enjoying a drink at a poolside bar with the Premier League defender before the mayhem ensued.
Trump said: “I was there and had spent time with Harry and his group.
“So of course I was very shocked when I saw what had happened. I had been speaking to him the day before.
“It is a bit scary to see what can happen just on holiday.
"I love Mykonos but I am always a bit wary when I go away on holiday anyway.
“The police can be strict and less tolerant than in the UK in some places, and I try to be extra well behaved so as not to get in any trouble.
“What happened to Harry might put me off a bit going back there.
"And it could also make people keep themselves to themselves, or always travel with security.
“It is different for me. Harry is a massive name, Manchester United captain and England defender.
"You can get people trying to cause trouble with that fame.
“He said he doesn’t want personal security and stuff, but maybe these days that’s what you need to do. Sometimes you can be too famous.
“For me I am kind of just okay, I can get by without too much grief, snooker is not like football – and I am quite happy with that.”
Meanwhile, Trump, who lost to Kyren Wilson in last month’s World Championship quarter-finals, gets the first tournament of the new campaign underway in Milton Keynes on Sunday.
Last season’s winner of a record six ranking titles is in Group One of the Championship League and faces the likes of Alan McManus, David Lilley and Fan Zhengyi.