with four. The Hamilton Tiger-Cats have a delayed home-and-home series with the Saskatchewan Roughriders as both teams have a bye during week 5 (in which case, the Tiger-Cats also have four such series). Front office changes Coaching changes Negotiation lists In late January 2018 CFL commissioner Randy Ambrosie announced that teams would be required to make public the names of 10 of the 45 players on their negotiation lists twice per year; once in February and once in December. The negotiation list is the process by which non-Canadian players enter the CFL; in lieu of a draft, teams instead unilaterally claim rights to any non-Canadian player by placing them on the list at any time on a first come, first served basis. The decision to go public was supported by the league's presidents, governors and general managers. On February 20, 2018 all nine CFL teams announced 10 players on their negotiation list. NFL window On July 20, 2018 the nine CFL owners voted to reinstate the "NFL window". All players who sign contracts after August 20, 2018 will be eligible to work out (attend try-outs and mini-camps) and sign contracts with NFL teams during the off-season. CFL rookies will still be required to sign two year contracts, but now have the opportunity to have their contract terminated if signed by an NFL team after their first year. Quarterback Safety In the middle of the CFL playoffs the CFL announced that they would be adding an eighth official to the final three playoff games with the sole purpose of identifying and penalizing any instances of violent impacts to the neck or head of a quarterback. The change came about as a result of injuries to Zach Collaros and Brandon Bridge who both received violent hits to the head. Rules changes In March the CFL's Rules Committee submitted a variety of rule changes to the Board of Governors, to be implemented for the 2017 season. As was the case in 2017, the proposed changes once again focused on improving game flow and increasing player safety. The proposals were reviewed and accepted by the CFL's Board of Governors on May 23, 2018. Accepted Coaches are no longer able to challenge 'illegal contact on a receiver' penalties Replay official will automatically review "potential touchdowns", where the ball was stopped just short of the end-zone Replay official will also be able to change the time