NHL teams have options for making trades at the NHL draft. For instance, they can use their first-round draft pick to acquire a goaltender. Also, a centerman that they've been covering for a long time is going through contractual problems with his current team.
So the team does not have a first-round pick after sending it to the Nashville Predators for defenseman Mattias Ekholm, general manager Ken Holland may try to acquire a first-round as this will be one of the deepest drafts in 20 years. It's quite possible they could use Oilers forward Kailer Yamamoto in trade to aquire more pieces to round out the lineup.