Please solve this error

Hi friends
 This is my stored procedure
alter procedure sp_excelforgeneralholidays(@filname nvarchar(max))
 as 
 declare @datavar varchar(200)
 declare @sql varchar(500)
 set @datavar  = 'Excel 8.0;DATASOURCE=' + @filname
 
 set nocount on
  begin
  --create table #temptable (Date date ,Day varchar(30),Reason varchar(100))
  set @sql = SELECT *  FROM OPENDATASOURCE('Microsoft.jet.OLEDB.4.0','+@datavar +;HDR=YES','SELECT Data,Day,Reason FROM [Sheet1$]')
 
  exec (@sql)
 end
In the parameter of storedprocedure I just pass filename with their location. But this query is not run correctly.please rectify the error  if i made the error.
and  the error when i run this storeprocedure
        
Msg 156, Level 15, State 1, Procedure sp_excelforgeneralholidays, Line 10
Incorrect syntax near the keyword 'SELECT'.
Msg 102, Level 15, State 1, Procedure sp_excelforgeneralholidays, Line 10
Incorrect syntax near ','.