Sub test()
Dim client As Long, semaine As Long, jour As Long
Dim c As Range, lig As Long, col As Long
client = 2: semaine = 3: jour = 4
With Sheets("FICHE CLIENT")
Set c = .Columns(1).Find(client, , xlValues, xlWhole)
If c Is Nothing Then
MsgBox "err client": Exit Sub
Else
lig = c.Row
col = (semaine - 1) * 7 + 2 + jour
MsgBox Cells(lig, col).Address
End If
End With
End Sub