A patchwork offensive line will take to the field for the Calgary Stampeders Saturday at McMahon when they host the Winnipeg Blue Bombers.

Both offensive tackles in Edwin Harrison and Dan Federkeil were knocked out in Monday's win over Toronto, meaning Spencer Wilson draws in at right tackle and import Garry Williams on the left.

Stamps Coach John Hufnagel says he's confident in both.

"These guys have been to camp and they're ready to play football. We don't really need to change. They're excited about the opportunity and they'll be ready to play."

Kick-off is 5 o'clock as the Stamps and Bombers battle for top spot in the CFL west.

Stamps quarterback Bo Levi Mitchell is coming off a 303-yard, two-touchdown performance against the Argos and he ranks third in the league with 810 passing yards.

Winnipeg counterpart Drew Willy has completed 75 per cent of his throws and ranks second in the CFL with a QB rating of 117.6.

This is Calgary's first meeting with a West Division opponent after starting the campaign with three consecutive games against Eastern clubs.

The Stamps and Blue Bombers split their two meetings in 2014 with each side winning in the other's building.

Calgary was a 33-23 winner in Manitoba on October 18 while Winnipeg prevailed 18-13 on November 1
 
Saturday is the annual Family Day Game and fans of all ages are invited to the Dodge Fan Zone for the Family Day Pre-Game Party.

The Dodge Fan Zone is located in the south practice field at McMahon Stadium and is free to attend with a game ticket.

The party kicks off at 2 p.m. with interactive inflatables, face painting, high-energy entertainment and tons of kid-friendly activities.

Also featured in the Dodge Fan Zone - Family Day Pre-Game Party are:

Stampeders & Dinos player autographs
Live DJ
Partner games and giveaways
Submit entry for chance to win a 2015 Ram 1500 truck
Chance to win an ATV by visiting the Pro-Am Motorsports tent
Sign up for the Kids Club, presented by Summit Kids
Inflatables
Outriders cheer team performances
Chance to purchase Stampeders merchandise
Little Miss Outrider

The halftime show on Saturday features Little Miss Outrider.

Aspiring cheerleaders ages 5-15 will take to the field to perform a special routine with the Stampeder Outriders.