Team are only two points away from fifth place on Manufacturer Standings.
‘La Pista Magica’ is the next stop on the Formula 1 calendar.
Alonso's contract contains a clause that opens the potential exit to the Spaniard if he is not within 25 points of the championship leader on September 1, according to sources.
On Friday test and reserve driver Giedo van der Garde will be driving the C33 during the first free practice.
The fastest F1 circuit held Round 13 of the 2014 Formula One World Championship on this weekend.
Reduced downforce levels lead to the highest top speeds of the year
Nico Rosberg has accepted responsibility for the incident that cost Mercedes the victory at Spa.
Silly season is certainly getting ready to go, but will teams respect contracts this time around?