England coach Steve McNamara has confirmed that captain Kevin Sinfield will start the game at Warrington's Halliwell Jones Stadium but is keeping the identity of his half-back partner under wraps until nearer kick-off time.
"I'm not too sure if I'm in or not so I don't want to get ahead of myself," Chase said. "I'm definitely not taking my spot for granted."
Since playing against England for the 2011 Exiles, New Zealand-born Chase has lined up alongside Sinfield in seven of the last nine internationals, with Myler stepping in against France and Wales last autumn when the Castleford player was injured.
Chase, the 2011 Man of Steel, has seen off competition from Huddersfield's Danny Brough after recapturing his sparkle in recent weeks but is now up against Myler, who has found the best form of his career for Warrington this season.
It would be no surprise if Myler was handed the number seven jersey on Friday, leaving Chase to battle it out with Leeds' Rob Burrow for a place on the bench.
Chase added: "We've got the luxury of having a bit of depth. There's me, Sinny, Richie and Rob Burrow all capable of doing a job. We've got to push each other. That makes us as a group competitive and that's what we want.
"I think me and Sinny have been improving every time we've played and it would be good to keep building on that combination. I've been playing pretty well, although we haven't been doing too well as a team (at Castleford)."
McNamara, who has maintained that Sinfield will be his captain for the World Cup as long as he makes the team, is delighted with the competition for the number seven jersey.
"The half-backs are in pretty good nick," he said. "Rangi's recent form has been very good and Richie Myler has been outstanding as well. We've some really good options there. I thought Rob Burrow had one of his best games on Friday night for Leeds."