Dimitrov had just beaten Medvedev 6-3 3-6 6-3 in the last eight at the Aegon Championships when he was asked to reflect on the announcement made by Evans at a hotel less than one mile away.
Evans admitted he had failed a drugs test in April and the International Tennis Federation have handed the British number three a provisional suspension.
"I just hear this, I had no clue. Any news like this, it's sad for tennis," Dimitrov said.
"It is what it is, and there are circumstances to everything. As I said, it's sad to see. Whatever it is after that, I think it's to be determined."
Evans will now miss Wimbledon and could face a ban of up to four years, but that will be of little concern to Dimitrov, who is fast becoming a contender for the title at the All England Club.
Dimitrov was tipped for big things after beating Andy Murray to reach the Wimbledon semi-finals in 2014 but he lost form and dropped to number 40 in the world.
Now, the 26-year-old Bulgarian is gaining momentum again and he will face Spain's Feliciano Lopez at Queen's for a place in Sunday's final.
"Feli is an extremely good grass court player. He knows his way around the court pretty well. Very experienced, as well," Dimitrov said.
"I'm in the semi-final of Queen's. I'm pretty positive, excited to get out there and perform again.
"It's been a while since I have felt that good on the court, so I'm just going to try to use that momentum, and whoever I play I'm going to focus entirely on my side of the court."
Lopez, who has always enjoyed playing on grass, is also heading to Wimbledon in a rich vein of form after backing up his run to the final in Stuttgart last week.
The 32-year-old battled past world number seven Tomas Berdych 7-6 (7/5) 6-7 (1/7) 7-5 to book his place in the last four.
"I'm very happy, everything that has been happening during this week," Lopez said.
"I think I have been playing great. The fact I reached the finals in Stuttgart was very important for me, coming to Queen's with a lot of confidence. Hopefully we can continue the great run."
In the other semi-final, fourth seed Marin Cilic will take on big-serving Gilles Muller from Luxembourg.
Two Americans were defeated as Muller edged past Sam Querrey 6-4 7-6 (7/5) while Cilic beat Donald Young 6-4 7-5.
