The world body that governs the rules of football is considering a proposal to allow players to wear heart monitors during games.
It follows the case of Bolton player Fabrice Muamba, who suffered a cardiac arrest on the pitch last year and was forced to retire from the game.
The proposal was put forward by the Scottish Football Association (SFA).
The International Football Association Board (Ifab) is due to discuss holding trials during a meeting in Edinburgh.
Its panel, chaired by Fifa president Sepp Blatter, has been asked to approve trials of an electronic chip in players' shirts that could potentially warn of medical problems.
The data from the chip would be fed back to a laptop computer, which could be monitored by medical staff and coaches.
The SFA proposal suggests the chips could monitor a player's heart performance, the distance they have run and changes in their body function.
Goal-line technology
Electronic communication between players and staff is currently banned, but some clubs already use GPS tracking devices and body sensors during training to assess performance.
The SFA proposal would extend their use to competitive fixtures.
SFA chief executive Stuart Regan said: "I think any information provided about a player's heart rate in a live match situation can only be useful.
"We don't know if a system like this could have prevented a Fabrice Muamba-type situation, but certainly providing coaches and doctors with real-time information we believe is a significant step forward."
Other laws due to come under scrutiny from the panel included goal-line technology, the offside rule, dropped balls and the use of additional assistant referees.
Ifab, which makes the laws of football, consists of the FAs of England, Wales, Scotland and Northern Ireland, who get a vote each, and Fifa, which has four votes.
Fifa General Secretary Jerome Valcke is due to hold a news conference later on Saturday, when the panel's decision are expected to be made public.
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