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Which players can Chiefs turn to for offensive boost?

The Kansas City Chiefs begin training camp Saturday, and their seemingly endless quest for more offense continues. The Chiefs were ninth in the NFL in scoring last season, but only with a lot of help from their defense -- which scored six touchdowns and forced 29 turnovers -- and special teams.

Where's that additional offense going to come from? The Chiefs are expecting the return of running back Jamaal Charles, who missed last season's final 11 regular-season games and both playoff games because of a torn ACL. Otherwise, the Chiefs are bringing back the same group of skill players they used in 2015. Their major offensive acquisition in the offseason was a lineman, right tackle Mitchell Schwartz.

Here's a look at possible candidates for that additional offense and how likely each might be to provide it:

Quarterback Alex Smith: One thing Smith has proved in his 11 NFL seasons -- and particularly his three with the Chiefs -- is that he's going to be the same player year in and year out. His key statistics haven't varied much in his last four full seasons as a starter, including one with the San Francisco 49ers. His completion percentage has been in the low- to mid-60s, his yardage within a range of about 300, his touchdown passes between 17 and 23 and his interceptions comfortably in the single digits. Expecting Smith to break from that mold and suddenly challenge for the league's statistical championships is unrealistic and unwise. He's going to give the Chiefs about what he's given them for the past three seasons.

Charles: Assuming Charles, who will be 30 in December, returns as the same player he was before his injury, he'll jump back into the featured role he occupied for several seasons. But the Chiefs didn't suffer without him. Counting the totals for Charles in the first five games of last season plus those of replacements Charcandrick West and Spencer Ware, the Chiefs rushed for more than 1,400 yards. They scored 14 rushing touchdowns. So the Chiefs had another big season running the ball. They just got production from three players instead of one. The return of Charles may help the Chiefs the most in the passing game. West may be at his best as a pass receiver, but Ware gave the Chiefs little last season when they threw him the ball. Charles had 70 catches and scored seven receiving touchdowns in 2013.

Wide receiver Jeremy Maclin and tight end Travis Kelce: These were the Chiefs' top receivers last season by a large margin. Maclin had 87 catches for 1,089 yards and eight touchdowns. Kelce had 72 receptions for 875 yards and five TDs. While those numbers could increase for one or both players, each might be at or near the top of his realistic potential, particularly considering that Smith is the quarterback. Maclin had his career high in catches last season, though he was nowhere near his career best of more than 1,300 yards he had with the Philadelphia Eagles in 2014. The Chiefs need to do a better job of getting him the ball when he can run after the catch. Kelce's stats took a slight bump last season from his debut season in 2014. If he's going to make a significant jump, this is a logical time for him to do it. Kelce turns 27 in October.

Wide receivers Albert Wilson and Chris Conley:Both are young and still developing players with potential to be nice complementary receivers to what the Chiefs already have. But as long as Maclin and Kelce are in the lineup, their opportunities are going to be limited. It's instructive that Conley's best game of his rookie season last year happened when Maclin was out with an injury. Both of his touchdown catches, one in the regular season and one in the playoff win over Houston, happened when Maclin was unavailable. Similarly, Wilson scored two of his three touchdowns last season with Maclin out of the Chiefs' lineup.

Wide receiver Tyreek Hill: The fast players are always going to stand out in offseason practices, which are conducted without contact. That was the case with Hill, a fifth-round draft choice. Still, Hill is legitimately fast. There were times during practice when he appeared to outrun the ball. The Chiefs were trying to find ways to get him to get him involved in the passing game. Hill could be a player who boosts the offense when the Chiefs use extra wide receivers.