"I think he should have strong consideration," manager Lloyd McClendon said. "You could argue, his numbers are as good as any third baseman in the league. But listen, everybody can't play in that game. It's just the way it is."
The Mariners know what they have in Seager, however, and Cano said his young teammate is just starting to tap his potential.
"He can be really good," Cano said. "Trust me. What is it, 2014 now? You will see in the next three years how good he is going to be."
Seager has been one of the best players in baseball the past month, hitting .409 in his past 17 games and winning his second AL Player of the Week honor this season.
Whether that surge vaults him onto his first All-Star team remains to be seen as American and National League rosters will be announced Sunday at 4 p.m. PT on ESPN for the July 15 game in Minneapolis.
Seager's numbers continue climbing by the day, as he's now hitting .279/.350/.498 with 21 doubles, 13 home runs and 58 RBIs in 81 games going into Wednesday's action. Oakland's Josh Donaldson, the runaway leader at third base in fan voting, is batting .245/.325/.459 with 12 doubles, 18 home runs and 61 RBIs in 82 games.
Among all AL third basemen, Seager is first in extra-base hits, second in doubles, home runs, RBIs, batting average, slugging percentage and OPS, third in on-base percentage, hits and stolen bases and fourth in runs scored.
Donaldson has a 3.5 WAR, with Seager at 3.3. The next closest AL third baseman is Adrian Beltre at 2.2. Beltre is currently second in fan voting.
Fans can cast their votes for starters at MLB.com -- online or on a mobile device -- using the 2014 All-Star Game MLB.com Ballot Sponsored by Experian until Thursday at 8:59 p.m. PT.
The rest of the AL squad will be determined by a vote of the league's players and by selection of All-Star manager John Farrell, with Mariners pitchers Felix Hernandez and Fernando Rodney also prime candidates to land berths along with Cano.