The Champions League will follow the Europa League's lead and have two extra assistant referees for the 2010-11 and 2011-12 campaigns.
The International Football Association Board (IFAB) has stated that the experiment will allow FIFA to take a decision on its long-term viability in 2012.
A statement from IFAB read: "The Technical Sub-Committee has approved several requests from member associations and confederations to implement the experiment with two additional assistant referees during the 2010-11 and 2011-12 seasons at a meeting held in Cardiff.
"At a previous Special Meeting of the IFAB held in Zurich on 18 May, the Board had reviewed the experiment with two additional assistant referees that was carried out in the 2009-10 Europa League and had decided to continue the experiment until the 126th IFAB Annual General Meeting in 2012, but not to limit it to a single confederation.
"Therefore, confederations and member associations wishing to conduct this experiment were invited to inform IFAB of their interest for a decision to be taken at the meeting of the Technical Sub-Committee in Wales."
Goal-line technology will be discussed at the IFAB's next meeting in October in the wake of the controversy that marred Germany's 4-1 victory against England in a last-16 encounter at the World Cup finals in South Africa.
With Germany winning 2-1, the officials failed to see that Frank Lampard's shot had clearly crossed the line.