Tarkowski was speaking before today's friendly against former club Oldham Athletic.
“It's been good," he told the club's website.
“It's been tough. The heat for the last week or so has been bizarre.
“Even though we didn't manage to go away, the heat has probably pushed our fitness levels on a bit more.
“It's nice to be back. The lads look great and looking forward to these games building up into the season.
“We just want to get cracking on again. Fans being back again is massive for everyone.
“We're looking forward to getting back out there playing again and it's another big season.
“It's our sixth season in the Premier League. We're not underdogs anymore.
“We're a Premier League team and we need to push on and keep showing that."
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